The parent is talking about using blockchain not just for payments, but as a building block for the web providing both identity and payments.
Also, why would we want bitcoin or any crypto if most people will just use Visa? How does that achieve decentralization? I doubt the goal of cryptocoins is just "replace the financial backend that big companies use".
The vast majority Og people will likely use a custodian for their crypto. For them it will feel like banking feels now.
Just like coinbase provide a visa card with collateral i your crypto.
So essentially these questions really are answered -- it is not an all or nothing. We will keep, eg. Visa to facilitate retailer transactions with collateral in, eg., bitcoin. Bow you can dispute and everything and you pay in crypto.