I love the technological improvements. I'm just saying that for what most of use ours phones for, the power would probably go to waste.
But you do make a good point about the viability of the phone for the future.
It's important to remember that phones aren't going to stay at this level. 20 years ago they were mainly for calling. 10 years ago it was for calling, texting, emails. Since then phones have become everything for a lot of us, video chatting/gaming devices/cameras/mobile personal computers.
In the past few years we've seen Samsung push VR on their phones, with iOS 11 Apple is trying to push VR, and now you have RED about to release a holographic phone. My point is, phone's are going to become more and more functional, and that extra power WILL get used one way or another, maybe it's VR or AR, maybe it's faster and better processing of the 4K video, or maybe its changing the lightning of your picture by using portrait mode (I guarantee this will get used by many people on Instagram).