I'm generations passed, there was usually a "killer app"--that one "must own" game that people bought a console just to play.
Pokemon made the aging Gameboy a phenomenon all over again. Many people bought the original Xbox for Halo and Halo 2, alone. Street Fighter 2 dominated arcades in the 90's and one year exclusivity made the SNES a must own.
Is that still possible? Is there simply too much to play and a single game won't matter as much?