Historically it wasn't uncommon to switch, but there was also not much continuity between generations. You would keep your account and friends list, but would b

Historically it wasn't uncommon to switch, but there was also not much continuity between generations. You would keep your account and friends list, but would be restarting your library from scratch on a new console. Both Microsoft and Sony are pushing for backwards compatibility which will give users a strong incentive not to switch since they can maintain a large part of their library.