[MOD Proposal] Faction revival

[Nehotep]

How about to make mod which allows already destroyed faction to reborn themselfs? Not right away, only if nobody take their lands very long time?
I`m in a middle of my Franks campaign and all cities in East Europe were razed (not because of me). The huge space of desolation, who will colonize this? Things are humming in South, in Asia, Africa but a whole territory of modern Hungary, Bogemia, Germany, Poland, Ukraine, Makedonia, Bulgary etc. is one big wasteland and year is already 435 - nothing happends. Half of factions is gone, this is unfair.
How do think guys? Is it possible?

[Delicate Strawberry]

This would be good, I'm guessing it would have to be some sort of rebel function maybe? I'd love to see this added. I liked to liberate allies in Rome 2, but I found the AI liberating at random, and sometimes liberating it's former enemies a bit endless. I hope someone attempts this.

[Nehotep]

Yeah, something like that was in 'Medieval Total war'. A last heir of faction with brothers-in-arms is trying to restore his throne. Of course only minor faction could do this, not WRE or ERE