If your pencil does not write well - do you buy a new one or sharpen your own / insert a new rod?
The problem with Citibank is that their program had the most disgusting interface, which is also very easy to mistake. The main problem is not that Citibank made a mistake and now can not return the money, but that Citibank MADE a MISTAKE BECAUSE OF the SHITTY DESIGN OF ITS OWN SOFTWARE and this must be understood.
Inventing another useless altcoin in order to fix this is shooting a cannon at sparrows. It is enough to bring a normal approach to the design of internal software so that such mistakes do not happen again.
Well shooting cannons at sparrows could work though, it could be overkill and useless to make it that high end, but it still is a working solution isn't it? Yeah you are right they could upgrade their system and have a much much better version of it, but why improve x2 when you can improve 100x ?
I believe if these companies finally manage to remove all these server required idiotic old timer stuff and replaced it with their own blockchains and made it work properly, they could actually get to a new world standard that was incredible.
It would be fast, it would be cheap and it would make 900+ million dollars go from one place to another in a few minutes at most. It would make it harder to reverse that of course but it would at least be simple to not mistake who will get the money, just take a look at the wallet address and you would know it.