I think the first proclamation about how x86 has reached its end I read was in 1992 when the DEC Alpha came out. (It's possibly of course there were even earlier ones.) The chorus became louder when Intel successfully convinced the entire world IA64 will work just as well as it is shown in a PowerPoint despite the failure of Multiflow, Cydrome and their own i860. The new shiny is always shiny... but it doesn't mean it's that much better. You mistake a very tight integration of the stack from silicon all the way up to UI for some miraculous efficiency of ARM vs x86. This is not so.