Hmm. Personally I think the whole "Emalgha Expand Like Interstellar Pufferfish" idea is kind of unrealistic. Yes, this in EVO, not reality, but wooden ships , people! I don't think they could become a major power fast enough. And if the Voinians saw that they were becoming a major power, all they have to do is mount a major push and retake Emalgha and Kalmaon.
I prefer the "Voinians Expand Like Interstellar Pufferfish" idea (made by Shade), which takes advantage of the other property of pufferfishes; there's a lot of space inside them with nothing in it.
Basically, if the Voinians take over the known galaxy, either they have to do it very slowly (which is difficult, because it's likely there's conservative elements among the Voinian aristocracy, and once your charismatic leader dies, things tend to reverse), or they do it fast, and overstretch themselves.
The second idea is the one I'm going with. So we have the hypothesis that the Voinians now control the known galaxy, and are way overstretched, having just conquered the known galaxy.
Now, we have to consider this; the Voinians have a large number of slave races in the heartlands of their empire. If all the ships and troops that would normally be keeping them in line are off keeping the Strand races in line, then it is the perfect time for the slave races to revolt. This includes newer conquests like the Humans and Emalgha.
So, for "inner" slave races, we have;
Dur
Ala - The Dur and Ala hate each other, but this might conceviably begin an arms race.
Hinwar - The guys who rebel in the original storyline. In this scenario, a successful Hinwar rebellion is almost certain.
Emalgha - If the Voinians have only just reconquered the Emalgha, there is likely to be some form of underground resistance, which could conceviably retake Emalgha. They did it once, they can do it again - especially since they'll be inspired by the tales of the previous rebellion. Unless the Voinians decide after the reconquest that Emalgha no longer has valuable resources, deport the population, and raze the world to bedrock. That's conceviable - they did a similar thing to Iri. However, if they deport the population, see below.
Dieri - There are only a few million Dieri left on Dieram, most of them having been deported, but if the slaves had some way to keep in contact, then a widespread Dieri rebellion could be very disruptive. Likewise, a deported Emalgha population could do the same.
Humans - The hairless apes managed to resist Voinian invasion for some time, and it is highly likely that they could remain in contact with each other despite occupation. A Human rebellion would be likely, but the Humans would also be the closest to the "outer" Voinian empire - the Crescent - and therefore the Imperial fleets.
Tientu - The Tientu are unlikely to revolt. They didn't when the Voinians originally invaded, after all.
So the Dur, Ala, Hinwar, Dieri, Emalgha and Humans would revolt successfully. I'm going to stretch the imaginations a little and allow each to free surrounding systems, and develop the space resources to defend those systems. However Human space would be far from the size it was before - there might even be two rebel Human groups, one in the West, based around Earth, and the other in the East, perhaps based in the former Independent worlds. These two factions would probably not have the best of relations - the West Humans would think that the East Humans' non-contributions to the war effort was what made them lose, and the East Humans would probably blame the West Humans for not defending them.
So the "inner" Voinian empire successfully revolts, and it's likely that someone - probably the Dieri - would use thermonuclear warheads to turn Voinia into a blackened, glowing hell.
The rumors of revolution, coupled by the death of the Voinian Emperor (or his burecracy? In some Earth civilisations, the Emperor has been a figurehead, and the real work is done by the paper-pushers), would cause destabilisation in the "outer" Empire - the Crescent. It's likely that the Imperial Fleets would begin to head home to re-establish Imperial rule (we would have the Humans and Emalgha to thank for holding them off) and then establish more localised, military-run provinces in the Crescent.
But, fueled by the Empire's instability, the Crescent would also revolt. In the North Tip, it would probably be led by Zacha rebels hiding in the Ji Nebula. We could expect to eventually see the establishment of a more militaristic North Tip state, probably with it's center further north than the current Miranu worlds. In the South Tip, it's likely that revolution would be led by the Kayians of the Akrayhek system. They're the most organised militia, so it's likely they'd be the most organised resistance movement. A Kayian-led unified South Tip government would be interesting, to say the least.
The Strand races would lead the rebellions themselves. With the Strand Council destroyed by the Voinians, they might begin to cooperate (if the Council was the instigator of the Strand War) or embark on genocidal pogroms (if the Council was actually a moderating force on the War).
Since it's likely the Voinians would also destroy Crescent Station, we could expect an influx (perhaps an invasion fleet?) of races from beyond the Crescent. The Zacha string tells us that there are races beyond the Crescent, but what they are like can only be speculated upon.
It's likely that here, too, the Voinians would be exterminated. Perhaps the Miranu might be kinder to them than the Strand races. But then again, the Miranu are very greedy, and willing to go to morally shaky ends for profit - witness the MTC attacks in the Ski Resort string. It's possible that the Miranu might keep the Voinians as slaves. This is a nice piece of irony, and it removes the general image of the Miranu as peaceful, love-the-universe people. There's little to suggest that in the original EVO scenario (little to disprove it, too, though).
Thus, the establishment of Voinian hegemony over all the worlds of the known Galaxy might lead to the destruction of Voinian hegemony, and the extinction or enslavement of the Voinians as a race.
Woo, that was long.
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"I suppose it's Friday night in America, so I oughtn't to expect heaps of people to be on, but honestly! Do all of you have lives?" - Me, #ev3