As far as I see, a lot of people here are very happy when they read news about this or that bank adopting bitcoin exchange, offering crypto related services or doing something related to crypto.
At some point I understand that people like it because they want to see crypto everywhere but the downside of this is that crypto gets more regulated and I think it losses the magic/spell that it had before. Personally, I think that more adoptions and regulations won't do any good for bitcoin, it will just become a little bit different digital version of fiat. I think as time goes, anonimity, decentralization and these words are fading away and they turn into myths like Greek gods.
If the banks do not make weird laws about regulating the whole industry, then I do understand that they would be fine with cryptocurrencies but at the same time the idea of them dominating the whole market is always there which makes it harder for the general public to appreciate the efforts that they might be putting into.
Banks integrating with cryptocurrencies might be a good thing for the holders since they would allow the bank customers and the crypto holders to trade efficiently without much efforts at the same time other banks might wanna do it as well because of the competition do that open doors for mass adoption, but how would it go? Since after that the government might wanna make stricter rules and regulations.
Then the countries would go in that as well and this way we can see crypto being accepted all around the world therefore it can both be a +/- thing.
Depending on how they take it.