Who cares the OS when the main use is surfing?
Microsoft was strong when computers had keyboard and mouse because users had got used to their logic. Tablets need to have totally different logic so ditching the MS now is really easy for end-users.
Every aspect of tablets is simpler:
- Main use and core functions: Reading blogs or books, surfing web, watching videos and photos instead if Word etc.
- Programs: If you really need something else than core functions you use single purpose apps
- UI: No more desktop, see new Meego. Chrome OS and of course iPad
- Settings: Who need, everything should work out of the box
- Controls: You can use one, two, three, four or five fingers
Learning curve for new OS is shorter. There is less reasons for user to pick Windows-tablet.