There is no ban but they're trying to sue those companies that they think wrong with their trading offers like Binance and Coinbase.
Is the future of cryptocurrency in jeopardy?
But let us say that the US did all of these and banned altcoin trading, so this means that there's no affection to Bitcoin so it's still fine then. However, no matter what stoppage and banning they do the market have been in many struggles and hardships of cracking down and more than this.
The future of the crypto market isn't going to what you're thinking, these scenarios are temporary and will later on be okay again.