That's exactly what Microsoft was counting on with their UI for Windows Mobile (even down to a Start menu) and why they make such a big deal about Office being

That's exactly what Microsoft was counting on with their UI for Windows Mobile (even down to a Start menu) and why they make such a big deal about Office being available across all their platforms. I'm sure that when the time comes, Apple will be prepared to throw away the UI and start over with whatever suits the next form factor.