Rabobank also seems to have a conceptual platform to facilitate crypto trading, that would be the first huge bank to adopt; however, it is still far far away.
Even if they adopt, I don't see any harm caused to the market by doing so. Since everything is decentralized, they can only become a portal and never own the Dapp itself. So I would be happy if banks start owning facilitate crypto portals, since this stimulates mass adoption! The only thing I am concerned about is banks becoming whales; however, I foresee legislation filling in this issue.