As with movies and music, consumers have come to expect increased portability with their media. Whereas a decade ago, movies were largely viewed at home, now they can be watched on a computer, in a car, or even on a phone. Even now, Sony and Apple are offering some cross-platform gaming opportunities, with interoperability between the PSP and PS3, iPhone and iPad.
With the advent of cloud computing services, like OnLive and Gaikai, it seems we may not be too far off from Kojima's predicted future. Until then, though, you'll only be able to play Kojima's latest game on one platform -- the PSP.