That's not going to make a lot of difference because US customers are already using bitcoin exchanges like Binance since a long time now. Also there are privileged enough to use bitcoin ATMs which are installed across the country.
No, I wouldn't agree with you in this case. I am not sure if you read
The history of bitcoin ATMs is much longer than I thought! wrote by The Pharmacist. He has struggled to reach Bitcoin ATM. So if more Bitcoin ATMs accept buy and sell Bitcoin then it will easier to cash out Bitcoin for US Citizens. Cashing out Bitcoin easily is a challenging task for me. Especially those countries that do not allow Bitcoin just imagine how hard for them cash out Bitcoin. Anyway, it's a good move by US banks, somehow it will encourage US users more to use Bitcoin.