Cash is instant. Venmo is instant. You can pay for goods with a credit card and know it was approved instantly.
In the very rare case you need to make a domestic wire transfer, yes it's currently slow, but that's not a technological problem, it's a political/institutional one. Plenty of countries have instant bank transfers as well.
AND -- instant bank transfers should be coming to the US in 2023, when FedACH is supplemented with FedNow (settles in seconds) [1].
So the slowness of wire transfers is just a temporary problem that's already been solved or is being solved. Crypto isn't necessary here at all.
In the very rare case you need to make a domestic wire transfer, yes it's currently slow, but that's not a technological problem, it's a political/institutional one. Plenty of countries have instant bank transfers as well.
AND -- instant bank transfers should be coming to the US in 2023, when FedACH is supplemented with FedNow (settles in seconds) [1].
So the slowness of wire transfers is just a temporary problem that's already been solved or is being solved. Crypto isn't necessary here at all.
[1] https://en.wikipedia.org/wiki/FedACH