[a8000]

Fast international money transfer is something that is already handled very well for those that truly need it. I know for a fact that the european central bank handles large volume transactions in a matter of seconds if not less. There is really no reason why traditional banks could not offer significantly shorter processing times for the majority of their services, it is just not in their interest to do so.

[moe]

it is just not in their interest to do so

Interest is the keyword here. Banks collect it on their customers' money while they declare it to be 'in-flight'. This is the main reason why transactions that should take seconds are still deliberately delayed for days.