Traditional banks will not be completely wiped out in the crypto era.
Internet networks, support systems such as cellphones and education about transaction systems using crypto are not yet understood by many people, someone is still used to fiat money and they prefer to see wealth in physical form.
If Diem becomes one of the stable coins, I think the Facebook developers have other ideas in the future, it looks like there will be other stable coins that Facebook will create but we are still waiting, whether the concept will be the same as the Libra coin or only Diem stable coins will be the same coins. they created to expand the use of USD currency