Is it possible that Bitcoin could increase its total supply in the future? But that would certainly cause Bitcoin’s price to drop significantly.
Could Bitcoin switch to PoS like Ethereum? That would also cause Bitcoin’s price to fall.
There is no need to worry about the future of Bitcoin and Don't be discouraged by the issue even though PoS is considered more energy efficient, everything has been neatly structured by Satoshi, there is no reduction or increase in the supply anymore and only 21 million Bitcoins.