Not stating to be an expert, but logic applies in every scenario. There's a reason people don't complain about battery life with their QHD smartphone displays. Marginally worse, sure. Nothing to cry about though. Most of the time battery life goes down because the screen size also goes up, but people assume it's due to the resolution. Logical fallacy.
I agree with your statement about glasses. I can't say it'll be for everyone, and certainly for style reasons it wouldn't be. If we're going with the masses, the next big thing is home automation and integration, which is already on its way. That category is boring to me. Can't say what else would be established besides those two areas. Cars? Not much more interesting than what we already have in traditional vehicles.