Except blockchain based currency can't solve the "402 problem" as you call it. They are far to expensive and would never scale to the transaction volume required.

And if you are going to say "oh yeah well Lightning Network will save us!". Lightning Network is the biggest pile of vaporware I've ever heard of. It's been "just around the corner" to save bitcoin for almost as long as bitcoin has been a thing. ...I do love the solution to scaling the blockchain is to not use it--a real ringing endorsement of Satoshi's Glorious Block Chain if I ever heard one!