We might have no choice at some point (like the choice will be made for us, by the planet), at the rate we're going.

But that being said, I think there are bigger fish to fry than bitcoin in that department right now.

And besides, if Proof-of-Stake becomes viable and desirable enough, they'll adopt it into Bitcoin's protocol, or some other Proof-of-Stake coin will eventually take over. Maybe it'll be Ethereum once it switches. Or something else. And then this will be a non-issue.