I heard that the reward is halved every 4 years after each halving, so the reward miners will receive will always approach zero. To maintain the Bitcoin network, the price of Bitcoin must keep rising infinitely, which is impossible. Could there be a point where the value of the Bitcoin miners receive is almost zero, and the Bitcoin network collapses due to a lack of miners?
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.
I don’t know if my understanding is correct
I think that when we reach to a point when the reward received from Bitcoin mining becomes unprofitable and price is already very high, then we should logically expect that Bitcoin will be very popular for that moment. Popular Bitcoin means full mempool. If we increase the block size and if there are a big number of Bitcoin transactions regularly (as it should be in the future), then miners will collect enough profit from transaction fees to keep mining.
It's easy for Bitcoin's price to rise infinitely because millions of coins are already lost and many people lose access to their private keys.