Lance stated win or lose he is done after the Tour. He wants to spend more time watching his kids grow up which is hard to do when you are on the road in Europe 9 months out of the year. He still has commitments with Discovery (off the bike) and will still be involved with the team helping to develop a new American Tour champion. No matter who it is (I think Floyd Landis is a good choice) they will never have the same prestige as Lance. Conquiring cancer made his quest have more appeal to the masses. There will never be another cycling champion like him!
Here is an ARTICLE from Velo News.