As I think the debates above make clear, for most generations, the difference in power between one console and the next was often negligible, and imperceptible to the majority of the target audience. This is the first generation since the 2600 in which one console is clearly inferior to it's competition.
Then consider that, really, we're talking only 6 real generations of games - 2600, NES, SNES, PS1, PS2, Wii, which is still too small a sample size to make any definitive rules about who will and who will not win. If anything, the most consistent variable seems to be who comes to market first, as that gave the 2600, NES and PS2 a big leg up on the competition, but even this rule doesn't apply to the SNES, PS1 or Wii. (The one clear advantage most of them had was the biggest library, but that's most likely the result, not the cause, of their success).







