I'd argue that if a large number of miners started maliciously rejecting certain transactions then this principle is at risk and the community has to react. Meaning even if 70% or more of the hashrate was malicious we still would move ahead with a hard fork that addresses this. Possibly an algorithm change the bricks their ASICs worth billions of dollars (if my math is right, that's 8.3 million ASICs).
I don't think switching the protocol would fix this. Apart from the problem of changing the fundamentals of Bitcoin, it leaves the same problem (still assuming this hypothetical scenario): exchanges won't be allowed to trade it. And even if decentralized exchanges can solve that, if it's against the law, I don't want to become a criminal because of this.
I think Royse777 summed it up nicely though:
Haven't they done everything they could in the last over 10 years? Bitcoin is going nowhere, not in the near future.
If they could have banned Bitcoin, they would have done it by now.