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[ilyapx]

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[NotATether]

Most of you do not know that almost 90% of altcoins are subject to 51% attacks, and if it occurs to anyone to do this, he will easily do it. I can't even imagine what will happen to bitcoin if it becomes 100 times cheaper, such a price will hit the miners very hard and they will most likely start to diverge, no one is interested in mining themselves in the negative when electricity is more expensive than mined coins.

Miners who don't want to go out of business as a result of fallen prices directly related to 51% attacks should not attempt to orchestrate them in the first place.

[NotATether]

no, you are wrong, the more miners the more the complexity of the network, if the complexity falls, then this is the end for POW cryptocurrencies. They become unsafe for storing coins.

There is no additional complexity when more miners arrive because the retargeting interval adjusts the difficulty back to equilibrium every 2016-block period.

It cannot fail even if most miners shut off their gear, the worst that would happen is that the remainder of the blocks in an interval become impossibly difficult to generate. Even this shut off can only happen gradually (there can be no coordinated shut down among multiple mining companies) so we would make it to the end of the retargeting interval by then and difficulty gets adjusted accordingly.

if bitcoin becomes cheaper, I have no idea what will happen to it. But most likely the developers will either change the algorithm or switch to POS

If bitcoin becomes cheaper then what I just described will happen to the network. And if blocks stall for an impractical length then you can't even make a fork to POS because without blocks being generated you can't even assign a starting activation block for it.