Don't tell me about vaporware ETH2.
The end goal for Bitcoin is Dyson spheres around stars. And it can be no other way.
0.1% of our energy being spent on Bitcoin mining is fine, 1% might be a little worrisome, 10% would be a real wakeup call, 50% would be a crisis, and 90% would be ruinous. Is there a natural limit? Competition from alternative currency systems with cheaper transaction costs, maybe?
I care. Everyone I know cares. The core developers care. The ecosystem cares. I think you are radically underestimating the value of such things.
Some Retail investors? Sure -- but I'm sure you could find misinformed investors in all fields.
The point nocoiners miss is that holding Bitcoin IS using it. It is storing value over larger periods, and especially through jurisdictions with poor fiscal policies. Many like me will not sell their Bitcoin at any price -- especially not for dirty fiat.