I've finally finished a game to test the dynamic colonial system in the mod I'm using, and I'm quite pleased with the results. Portugal, 1821. I'll be breaking this down by region to make it simpler.
Europe:
-The blobs of Bohemia, Burgundy-France, and Austria were incredibly quiet once they'd eaten all the minor powers. There was barely any movement in Europe in last few decades.
-I've had Spain in a PU for the past two hundred years without inheriting. Very annoying.
-Wales used to be really powerful, grabbing territory in random places like Arabia and Georgia, but the loss of most of their colonies really hurt them and they focused on peaceful expansion after that.
Africa:
-Morocco has been exiled to the African interior, west of the massive Yemen.
-The Orange in the south is in fact Orange, the only African colonial revolter.
-Not much else to say here, except to mention my mass-settling in North Africa. Once SA was completely colonised I took a break and spent my colonists messing around with that decision. Portuguese North Africa taken quite literally.
Asia:
-Baluchistan has been one of the strongest powers in this game, controlling basically all of India that wasn't in my sphere.
-The Golden Horde managed to survive by carving an empire towards India even as Russia advanced from the west.
-Japan was doing well in the East Indies, until I showed up there.
North America:
-The USA, Quebec, Texas, Mexico, Jamaica, and Antilles have all appeared thanks to the colonial system.
-USA has been very expansionist, finishing off most of the remaining natives and invading both its Texan and Quebecois neighbours repeatedly. It also allied with France in an amusing RL parallel.
-Mexico stretches all the way to Alaska, another effect of having dynamic colonial revolts.
-Mexican revolts almost overwhelmed my forces in Portuguese Mexico, but I guess the fact I won out shows a player still has a huge advantage in holding onto colonies in this system.
South America:
-Not much happened here after colonisation finished. As I was stable there weren't many colonial revolts, and since the rebellious colonies were all far in the north there was little chance for the rebellions to spread by event.