Sony and MS wanted their respective motion controllers to expand their market into family oriented games right? Like the Wiis'? At least for MS, the Japanese developers they interviewed during TGS were all core game developers, can you imagine Kojima for example making a Wii Sports Resort like title? No one among the superstar Japanese developers even remotely looked like they wanted to make casual games on Natal. Nintendo spends millions on R&D to make the games targeted at everyone, that is a big difference. MS probably will have the most advanced gaming system with Natal, but they don't have the most advanced R&D game development for it, neither does Sony.
If you look at the whole Wii package, the look of the system, the menu navigation, its very approachable, all the buttons are huge and feels and sounds very cheerful. You compare this feel with PS3 (super slick) and 360 Blades (youthful and absolutely boyish), the appeal is not the same at all.
Both MS and Sony have a lot of promoting to do in order to market this latest direction of theirs, but it will in fundamental ways, not fit with their core marketing style.
This Generation, according to the profit numbers here (http://www.vgchartz.com/forum/thread.php?id=57802). 360 and PS3 are still money losers. I can't see either company really wanting to go with a new console in one or two years and volunteer to lose more money quicker. I remember both companies said 10 years lifecycle for their current gen hardware. Nintendo didn't have to subsidize their consoles at all and they didn't say x years.
Nintendo Home Consoles release dates (http://en.wikipedia.org/wiki/History_of_Nintendo)
- Famicom 1983 July (world wide release 1985)
- Super Famicom 1990 Nov
- N64 1996 June
- Gamecube 2001 Sep
- Wii 2006 Nov
Seven years, then six then fives! Five years from 2006 is ... deng-deng-deng 2011. Of course I'm just bullshitting :p I don't know jack : /