a) Which just further proves my point that you shouldn't lump NFTs with Bitcoin. In practice however, all of the valuable NFTs are on Ethereum (afterall, NFTs are only as valuable as their underlying security)
b) Not sure what your point is. Global climate change is by definition a long-term problem, and yet you're fretting about a couple of years. Right. This sounds more like a personal disagreement with Ethereum than a genuine interest in supporting green cryptos.
NFTs on PoS chains exist today. Some artists explicitly chose those because of that. Everyone else needs a good answer why they didn't, and if "I can't get as rich with those" is a good enough answer. Especially given the push for legitimacy connected to NFTs.
b) if you choose today to put yours on ETH instead of a chain that is today not PoW, you don't get to play the "but soon(TM)" card IMHO