this is how i imagine "lobbies" will look one day.
you log into xbl/psn or whatever. you're in an open world with other people. it basically acts like a portal to other games. but i imagine it gta style where you can roam and fukk around if you want.
if you wanna play 2k, go down to the arena.. track for racing.. club if you just wanna be social.. arcade for some mini games or whatever, mall for some online shopping, etc.
no idea how you'd fit in all the genres but i'm sure they could come up with something