Is ARM's power advantage really that significant for devices larger than the smart phone / tablet form factor? If an Atom-based CPU consumes ~2-3 extra watts but offers marginally better performance and (more importantly) compatibility with an enormous base of existing applications, that doesn't seem like a very compelling argument for switching.
Is ARM's power advantage really that significant for devices larger than the smart phone / tablet form factor? I'll bet $5 that the MacBook Air in the future (18-24 months) will switch to ARM once the >2GHz ARM processors start shipping en masse. The Asus Eee PCs running Android with Snapdragon processors already embed the Cortex-A9 MPCores.
Hope you're still around in 2 years; it can be interesting to ponder a falsified prediction and wonder, why did I believe that?