It's not all Wii, Microsoft has made a few family games such as Viva Pinata before, and Peter Moore said that their "strategy has been laid out for us years in advance." However, he also hints that the solution doesn't necessarily involve games but "more experiential" updates. This is where motion-sensing comes in. Currently Xbox 360 is the only next-gen console not to feature a motion-sensing controller, question remains how long?
Speculations aside, according to Moore, Microsoft is going to rely more in downloadable content in the future, "Digital distribution is coming. All three consoles have some form of it as you know. Xbox Live Arcade is, I think, the premiere way we're looking at digital distribution, which is, if you will, more snack-sized games rather than full downloads of multi-gigabyte gaming experiences."
Source:
CVG