One to watch ...
I called the current statis in smartphones 4 years ago (not that anyone was listening ...) with 2 exceptions.
1) Battery life (yeah, still waiting for that one)
2) Screen/UI design more adapted to older/less able users (because eventually age makes us all "less able").
This is the first serious development looking at (2) I've seen. It may survive, it may not catch on. But it's certainly where I would look for innovation and investment.
Incidentally, I still think (1) could be partially addressed by selling phones in pairs with a clever base so that taking one out activates it while putting the other one in charges it. It solves the issue of making a phone available 24/7.