If miners had to 'find something else profitable to mine', they'd just start mining
double spends depositing BTC to the exchanges that are trying to fuck them up.
They won't, because in this case miners will get fired either through PoW change or by users switching to other cryptos or leaving cryptos altogether. Miners have strong economic incentive to obey and they will, provided that economic majority is indeed a super-majority.
No. The reason they won't is that they aren't going to waste precious mining resources for attacking a worthless UASF altcoin, while they can still use them for mining the good old bitcoins.
You guys really don't get it.
Bitcoin protocol has been designed to resist governments and the financial oligarchy. I'm talking about institutions that wage wars killing millions, just to benefit from it.
And it has resisted...
If you think that a bunch of users or some developers can achieve what the world's biggest money makers haven't, then you are obviously delusional.