I'd say that would be the day to abandon pools 
Sure, but pools are an integral part of Bitcoin. If we experienced a 51% attack, which is either ignoring 1% of the blocks or replacing a chain that contains an OFAC transaction, then I'd have lost trust on the integrity of the system. The whole concept relies on the theory that honest hash rate overthrows malicious. Double-spending is prevented under that assumption.How are those decentralized exchanges gonna cash you out without knowing your name and IBAN? People who do these transactions will be targeted this time. When people move to dex, the volume will skyrocket there. I don’t think you can get in and out so easily when that happens.
You will still trade normally by handing over your IBAN. If things become ever stricter than that, and they start freezing your bank account because of this, there is still cash.