I'm quite sure that we're pretty close to seeing banks offer vault services for crypto enthusiasts and investors. In this case you contractually make clear that you want this or that to happen with your coins when you are gone.

Times are changing. This market no longer consists of cyber punks, but average people trusting their bank more than anything else. Their fiat and precious metals are stored in banks already, so why not crypto too?

I personally will never allow anyone to have control over my coins, it just doesn't feel right. For the first ever time I can digitally hold what I own myself. I'm proud of this and will continue to be so.