@OP, you need to remember that Bitcoin was designed that it can't be changed by banks and banks buying or offering Bitcoin doesn't change anything in Bitcoin's functionality.
Important is to keep your coins off exchanges, note down your private key and if so, it's your Bitcoin and you can spend it whenever you like. Important is to have your private key.
What do you guys think, should banks even be in 'the game'?
Banks trying to gain something from Bitcoin is just what would happen normally anyways. Everyone will try to profit from Bitcoin and that's also a good thing (game theory). Even if someone doesn't like Bitcoin at all, it's profitable to hold. And after all, profits are important for banks or investors.