Another idea is

Once banks are allowed to custody Bitcoin, they will offer high interest savings accounts higher than the 4.5% based on the federal interest rate.

As soon as the first bank offers this new "Bitcoin powered savings dividend" then all banks will quickly all have to offer it.

So even people who only trust in dollars will be saving into Bitcoin interest products.

Or we could just hyper-bitcoinize by next year and everything would just be Bitcoin with no yield.

However, what's the likelihood of this happening. Might as well offer products that people want.