They cannot regulate crypto itself. They can come after you when/if you sell into fiat (never do that). They can regulate/forbid businesses from transacting in it (kinda), but they cannot touch my coin, nor force me to sell, nor stop me from sending it to other honest citizens. Impossible.

As for the banks, there are only two things that can happen to them in the end:

(a) a critical mass of people wake up and take a stand, leading to revolution, as has happened all throughout world history. Because the elite few can never control an ‘awake’ many.

(b) The USD dies (along with the rest of the modern fiat currencies), just like every other fiat currency that has ever been created in world history. (Just go ask the Romans what brought down their impenetrable empire)