Ledger at the CB only, and no trial bank. Everyone with a wallet at the CB, accessed via a phone/device.
There is a need for change management, but not a trial bank (CB can privately check the mirroring of existing bank accounts).
A bank, lender, or credit card company is an intermediary - and blockchain is at heart a P2P technology that eliminates intermediaries. The CB network, combined with P2P technology, creates a monopoly – that can be easily regulated, with 21st century tools. In a Canada, this is existing practice, and we still do everyday banking. If you do what the regulator (OSFI) tells you, when they tell you, you will enjoy a nice life. Don’t, and you will either be replaced, or permanently kicked out of the banking cartel. It works, it is effective, and it is robust.
Very different to the practices in many other places, that rely on both old plumbing, and the plumbing staying that way. Blockchain doesn’t rip out the old plumbing - it by-passes it, and makes it too expensive to use. Those other places can bitch all they want, but they either get with the program or go out of business, as economics is a bitch.
Of course, the underlying assumption is that the ruing CB isn't corrupt. We have Bitcoin as the antidote, it was designed for almost exactly this condition (zero trust), and it closes the circle. Next time you see an anarchist, give him/her a kiss!
Yin and Yang, alive and well.
SD