If they won't unbank Coinbase and Binance, Bitcoin will be fine. If they do, the price will instantly plummet, adoption will either slow down significantly or turn negative. But it seems like the chance of them doing the latter are very low, since this is a very unofficial rumored crackdown on smaller businesses rather than a total ban on crypto.
They can't unbank Coinbase because they are a publicly traded company and that would hurt the US stock market as well (and at this point they might as well be talking about unbanking Kraken as well).
And they also cannot unbank Binance because they already did that when they banned Binance from operating in the US a long time ago. The only thing they actually can regulate is their US arm which is irrelevant to the rest of the world.