Not only that, you could easily get online functionality on your favorite 2p games, ala TMNT and Double Dragon.
IMO, this is the way retro titles need to go - more and more arcade classics that feature 2p modes.
My 2 most-wanted XBLA titles are:
Virtu-On Cyber Troopers for DC/Sat (cant remember which)
Goldeneye 007 (with 4p online).
Back from the dead, I'm afraid.