Microsoft is destroying itself, by failing to understand and nurture its own business niche.
It had a near-monopoly on the business desktop. That was its niche. Even after losing the server-protocol war with the EU, Office should still have been an all-but-unassailable advantage.
So what does it do? Instead of listening to its business customers, it listens to the numerically larger number of home users who bought an MS system for lack of an alternative. then it redesigns all the interfaces to suit its idea of Joe Public (which appears to be even more drooling than Joe actually is). Office has suffered three interface redesigns in ten years, each reducing the productivity of a skilled user of office 2003. Now they've done the same to Windows.
Joe is unimpressed. There's Apple, offering a superior consumer-orientated product range at a superior price. There's a host of companies selling Android pads into the fastest-growing non-keyboard sector. Joe never had a good reason to buy Microsoft, it's just that to start with there weren't any alternatives.
What hasn't materialized yet is a really good Linux- (or Android- ) based business desktop solution set with a big corporation backing it. IBM? Apple? Oracle? Samsung? China inc.? The next young Nokia (who started off growing trees and making tractors before getting into cellphones almost by accident)? Even (long odds) a fully open community project? Whatever, when that business alternative arrives, Microsoft will be finished, because for the last decade it's given them every last reason and more to regret their dependence on Microsoft. A trickle of defections will become a flood.
It's got nothing to do with which CPU goes inside at all.