I think the next time we see the home world clans things will be different.
I think what we considered a "big" clan touman pre-Reaving will be half the size of what we see in 75-100 years. I know the 3085 home worlds are wrecked but look what the clans built before and look at those odds against these:
1.) Only 4 clans now, less squabbling for resources, more to go around
2.) Better cooperation... much better
3.) All clans are pragmatic and intelligent planners... the level headed clans survived.
4.) 1 major power that is thinking long term about growing all the clans with a goal of being able to re-invade (remember this is the Adders who didn't get in the first invasion cuz they bid, ya know, garrison forces and support equipment geared to a long invasion)
5.) You don't have to hide, they can raid periphery states regularly cuz the IS knows where they are. Also, with IS clans ban on returning no one is coming to visit
6.) Potential, they have half what they had when the clans started, so that means they are ahead of the curve.
7.) Advance tech, remember they have advanced Star League tech for lots of things, not just war machines
8.) New dynamic leaders. Maybe it's just me but it seems like the crop of Khans at the end of the WoR is thinking about a lot more things than fighting wars and who has the best honor. If they adapt to some areas like they have to cooperating, increasing Watches and so forth they can grow exponentially.
OK [soapbox] I'll get down now