Can't beat them, join them
I've said this before and I'll say this again.
Labouring youself with x86 is like trying to race dragging a trailer behind you. The only way Intel have stayed halfway competitive with their mobile Atoms is by being streets ahead in process.
If Intel were to dump x86 and make mobile chips on a level playing field (ie. ARM) they'd be ahead of everyone else by a long way.
Except of course that Intel will struggle to make money. Their whole corporate culture is geared to high margin products (x86s that sell for $hundreds). The biggest challenge for Intel is adapting to the market where quad-core ARM socs cost less then $10.