There is but it would be a lot of methods that they have to add at the same time. But bitcoin as their choice, some of them really are having interest on it but we can't be sure if many of them will.
For sure banks have a lot of procedures for that and when banks will invest in bitcoin, I think they will think to their customers if one day their customers withdraw money at any time in case of inflation. especially if bank customers with large money holders, the bank may choose low risk rather than losing their good name.
Banks will invest on Bitcoin if the volatility and manipulation will be addressed properly. But since its decentralized the chance for a bank to fully embrace it is very slim. Maybe they will invest on blockchain research and develop there own currency that will satisfy all there requirements and follow the legal guidelines. Let's think broad here and not YOLO on Bitcoin. Blockchain is the main reason why Bitcoin is a massive success and we all know that it's open source so there's a high possibility that these rich bastards and banks will be united and developed a new toy cryptocurrency for them to save there assets once this hyperinflation hits hard the global economy.