AR, if they can get it into a contact lens or even just normal glasses, could totally replace phones. VR has a few more hurdles to jump. It's not going to get far as long as it's a nausea-inducing toaster strapped to your face.
As for predicting what will happen in a few decades, technology's moving way too fast now as it is. We might be on the cusp of superintelligent robots really soon. When those come around, all bets are off.