This question is discussed and written extensively in Sci-Fi literature. I am sure it is studied by scientists.
There are issues. If the society doesn't have external challenges it will stagnate and die. Totally peaceful society, even ultra high tech, will be destroyed if they do not yield. Only question is if there is a place to go or more like for how long time such place is available. Militarily strong will also lose. There is always one that is stronger, society rottens from inside... These and other cases can be named and read from the history books.
Humanity as we know is on one planet. It will unite only under external thread and even that is not guaranteed. My bet is that it would be less than 50% change.
Bookmarks