this is pretty much a given.
within the next 5 years computing will look like this.
smartphone - I don't see this progressing much beyond current iphone/android deal. I mean more powerful, more RAM, and eventually pico projectors and NFC, but beyond that stuff, how much more can phones really advance?
tablets - like you're saying, this will be the majority of what people use for typical computing. aka what the vast majority of desktops were bought for 10-15 years ago. playing games, browsing sites, reading, media, etc.
ultra-portable laptops - macbook air and such.. honestly within the next five years I'm predicting this segment will cover 90% of non-tablet computing, but will still be dwarfed considerably by tablets. This will be the new power segment. content creation, desktop computing, etc.
laptops/desktops/servers - I'm lumping all of these together because though some/all may still remain, they will be EXTREMELY niche computing devices. Obviously servers will still absolutely be around.. and you'll still see the super high end workstations and possibly laptops... but my guess is outside of the business sector, seeing any of these devices will be like seeing a ferrari or tesla. 99.9% of residential users will be served by the 2 previous segments.
as for the news.... man... it sucks. This guy helmed the company during every period where they brought to mainstream more shit that is ubiquitous with computing than possibly any other company around today... hopefully he's taking the time he has left now to actually enjoy life and enjoy the fact that he changed the world.