Another thing I think will happen (and I know this sounds crazy) is that there will be LESS divisiveness because people will be more in daily personal contact with friends, coworkers, customers and others. Less online communication means better understanding and a certain relaxation about others' viewpoints.
This is for most normal people. There will still be the hardcore idiots on the Left who won't be able to let it go. God knows what's going to happen to them, I don't know how you get more batshit than batshit crazy.