I've always figured there would be a few types of computers that can do everything alright, ie. phones, laptops/tablets and desktops (especially with peripherals). These are very good for lifesyle, etc.

And then there are computers that can do one or two things extremely well (ie. bitcoin miners, robots). Cloud computing and storage are opening up interesting new avenues, and cryptology is keeping everything safe, but there are still some things I don't feel comfortable having on the internet. Air gapping is still the best failsafe we have. Also, if we want computers to be extremely efficient and tiny, we will only make them useful for what we are using them for.