The consensus on the forums is that the IlClan is going to go on a rip roaring rampage of revenge through the Great Houses.
Failure to bend the knee will paint a target on you. Clans have long memories and neither the Alliance or Dominion is as strong as a Great House. Just saying...
This I don't actually doubt. But the problem is that's going to take time. As far as we know there's going to be 3 players in the final fight
Falcons
Republic
Wolves
and again there could be more, the Bears might turn up unannounced etc, but at the end of the book the fleet jumping in MUST be the Falcons, Malvina's insane and she simply can't let the Wolves get the big shiny prize. Of the other Clans that we know of the Horses don't have the military strength to pull off a move like throw everything at Terra and the Falcons and Lyrans and Republic are still in the way. The Ravens are in the same boat but even further separated by distance and at the short end of the military stick, and the Bear/Dominion simply does not seem interested and is happily gobbling up Kuritan space with no real movement towards the Republic. That leaves us with two, the Falcons who are lead by an Omnicidal maniac and the Wolves who are lead by a guy who's name has some serious historical conqueror connotations to it.
Who ever wins out of the Falcons and Wolves (At a guess) they are going to be in no fit state right away to do much other than plant flags everwhere and get REALLY drunk in the party afterwards. Their Toumans are gonna be beat up, even if, again, assuming here, the surviving RAF forces either join them or stand down, and don't keep fighting in other systems etc. And the other Houses in the region then don't go "Oh naw you didn't!" And attack on their own. Assuming that the IlClan can hold onto what its captured and secured Terra and the surrounding systems as well as preventing uprisings etc and rebuilding factories and so on and so on. THEN they could think about going on an extremely vigerous walk to Marik space or Lyran space .
Just securing Terra and all the other stuff could take anywhere up to a decade before the populace stop trying to leave landmines in your beds for all we know.
Sure after 10, 20 years after the IlClan has actually secured its holdings and expanded, then the more outlying Clans IE the Bears and Ravens and the scattered Sharkfoxes might very well bend the knee and all hail the ilClan. But whilst the IlClanship is a win condition for the Clans, and back during REVIVAL it MIGHT have been an instant win condition (assuming the Clans political rivalries and inter clan rivalries don't make them turn Terra into a Mech Moshpit). Nowdays, over a hundred years later, the instant win condition is long gone, and really I don't think anyone really knows what to do or to expect when a Clan becomes ilClan. It's now become a case of
"Now what?"
"I do not know, no one ever thought we would get this far."
And obviously i'm just guessing here, I probably am utterly wrong, and its why I'm counting the days until the 2nd book :D