Otherwise, the big PC makers will be Apple, Google and Amazon. The irony, of course, is they won't be making anything. Except money.
Yes! Apple, Google, Amazon will do very well selling hardware together with apps and web services but they are not selling PC’s. They will be the big three of mobile devices – phones, tablets, etc.
The general-purpose computers - PC, Mac’s - will continue to exist for a long time. The post-PC era will include PC’s.