i'm just looking forward to the inquisition period. it's going to be delightful. i can only guess at how many characters, minor or otherwise, will fall to them.
but likely i suspect what they'll do is take over the crownlands and essentially hold tommen prisoner. what you'll see then is all the kingdoms basically scatter to the wind as they abandon the iron throne in all but name. even the lannisters will, as the last remaining intelligence lannister in power is dead (kevan). it'll basically make westeros perfect for an all out invasion.