"Bitcoin mining will become unprofitable."
This one cannot happen. If mining is not profitable, then the network will not be secure, so activity and fees will need to be high enough to cover mining costs. If BTC goes fully mainstream mining will still be very profitable.
Bitcoin will become more scarce
It's price will go up $200k or more
More Bitcoin multimillionaires will be created
More adoption and greater regulations.
Change in import of seed phrases and new bitcoin technologies.
Bitcoin mining will become unprofitable.