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
You're right that Bitcoin’s mining rewards get smaller every 4 years, which might make it seem like miners could eventually stop if they aren’t making enough. However, in the future, miners will mostly earn money from transaction fees, not just the block rewards. So, as long as people are using Bitcoin and making transactions, miners will still have a reason to keep mining.
As for increasing the total supply of Bitcoin, it’s very unlikely. Bitcoin’s limit of 21 million coins is a core part of what makes it valuable, and changing it would cause a lot of trust issues.
Switching to Proof of Stake (PoS), like Ethereum, would also be a big change that most Bitcoin supporters wouldn’t want. It’s possible, but it would face a lot of resistance and could hurt Bitcoin's value.