Banks onboarding with crypto and accepting Bitcoin is an attempt to get ahead of DeFi and save their own asses.
Banks are not our friends, but they are also not stupid. They see the writing on the wall and they are going to fight tooth and nail to retain the power they have in our society. I think that especially for boomers, the idea of keeping your Bitcoin "safe in a bank" is going to be appealing, and perhaps it will drive adoption I to the mainstream. But don't forget that centralized banking systems are the enemy here.