I kind of know what you mean...But, I say just wait and see what this next generation brings. I remember reading somewhere that the total leap from this generation of games to the next in terms of graphics and hardware can be comparable from the jump from the Original consoles to the 32-Bit systems or something like that.
But I'm with you, back in the days of genesis and snes were some of my favorites. You're a Metal Slug fan? Me too.
Anyways, my opinion is, if you've been a console gamer all these years, you should stick it out and see what kind of games weg get see at launch.