Is that really what we want?

imho there should always be a place where people who disagree with the powers that be can go and do their own thing.

Again, my opinion, but I think maybe 80% unity is the way to go.

I doubt we'll ever end up with a future wherein all of humanity is fully united and working towards a unified society. But that doesn't necessarily have to be a bad thing. Divergence in beliefs and attitudes can be a healthy thing as long as it doesn't hurt the individual.
Maybe, in hundreds of years, we might unified enough that we can tolerate and accept each other's differences. I have no idea what that future would look like, but I'd be happy if we manage to achieve that much.