Now then, ask yourself this. Has there been a company other than Nintendo to maintain success on and after a third console generation?
The only companies I can think of that even made it to three generations of consoles are Atari, Sega, and now Sony.
Atari's 7800 was a bomb, living only by backwards compatibility with 2600 titles, and the Jaguar was even more of a joke. Both consoles added to the destruction of the past's Atari.
The Saturn was a commercial flop everywhere, with only minimal success in Japan. Succeeded by the Dreamcast, we all know how poorly the DC faired with rumors about the PS2 ever present.
Now we've reached the PS3. Will Sony be able to overcome this curse? As of now, probably not. The gaming unit is facing similar problems to what Atari faced years ago. People don't want the more expensive unit, and instead buy the old, cheaper game machines available, in this case, the PS2, Wii, and 360.
If SCEA makes it out of this generation, I doubt the department will survive the next generation without a new innovation. Likewise, the next Microsoft machine would do well to create some sort of innovation, or they may receive the same treatment Sony has this time. The question is whether or not the innovation just needs to match Nintendo's motion control, or if it needs to be all new. We'll have to wait and see to learn our answers, though.