Countries that have failing currencies can tell you first hand!
It is not IF but WHEN the almighty US Dollar implodes!
To a certain extent you are probably right but not entirely! We have not yet realized the full potential of bitcoin and blockchain. In the meantime, the international trade and inter-country settlements are mostly done using the US dollar. With this robust demand, I don't see US dollar imploding anytime soon. The ongoing economical structure of our banking structure is obsolete but at the same time, we don't have any other option in hand. Cryptos can definitely bring many changes in that, but the volatile market price remains as a biggest bottleneck towards mainstream adoption.
So radical thinking like yours, would not help at all. Change is imminent but that has to be done wisely and we have to allow the free market take the decision and it is too early to draw a conclusion!