That and to release a new console in 2010 you would need to have gaming studios starting developement on games for that console sometime this year and right now I don't see them queuing at the door to do so...
They are barely going to start to reap the benefits of this gen this year, investing in the next gen is far from their main concern.
The best third party support a next gen console would get would be the port of titles that would on the PS3 and Xbox360 too.....
The huge increase in the development cost of games for this gen alone is going to make it last longer as it will take companies longer to recoup their investment.....