Mark my words, before too long banks will be offering to hold your bitcoin for you (securely of course) and transferring between fiat to btc, and back, with little to no fee as incentive.
I'll say it again. I would trust some of my btc to a traditional bank, as long as
- The deposit is backed by (audited) crypto or undilutable bank stock (ordinary bonds would be OK too)
- I get my interest (in btc). A reasonable 10% or something like that, depending on market conditions.
These banks will find out that luring old school hodlers to part temporarily with their precioussss takes more than a flashy brochure.