Dear op, i am just stunned to hear your first question (no disrespect) but i think you do not know why SEC sued Binance. They did not banned altcoin to sue Binance but they sued Binance for trading of those altcoin which are declared as securities and those securities (alt or specific token) were not registered with SEC. That's why, SEC sued Binance and halted the trading of those coins, but also many other coins too. (Which were in pair of BUSD and BNB).

For your second query, No, future of cryptocurrency can be changed by the impact of USA only because Binance is just one of the many exchanges, which provide exchanging, trading and staking etc. Feature which any other exchanges could do by replacing it maybe it could be registered with SEC. So, be positive and remain patient, because AFAIK, they just want to develop such cobditions in which they could buy more BTC in lesser money. (I hope you got my point).