They may want people to but it is happening very slowly. One big problem is that XP has all the features most users need and a big price tag on windows 7 doesn't help. Every windows before XP ended up having large game breaking issues which meant the customer base would switch quiet fast to the new one when it came out. Sure windows 7 is a nice addition on top of XP but in terms of day to day usage most people would easily be able to get by on XP.