This is very much so like the entire cargo/freight "Hyper-Loop" thing, or Rocketship cargo/freight, or even the Supersonic Aircraft thing... a solution in search of a problem.
There are very few scenarios were someone legitimately (and more importantly, frequently) requires sending a package to the other side of the world within minutes. Would it be nice? Perhaps... but just as Concord found out, after the novelty wears off, few actually want to drop $10K on a one way ticket.
With huge amounts of money being transferred, the delays are in fact a feature. It gives you time to cancel if there was a mistake... and it gives banks opportunity to sniff out fraud/laundering, that the money is in-fact real and not pending other transactions, etc.
I've just never heard of a scenario where someone needed $50k instantly sent anywhere for anything. When dealing with that amount of money, in a non-reversible/permanent system... being careful, deliberate and slow is pretty much what you want.
Even Bitcoin transfers are not instant...