They sure are interested in blockchain technology. My guess as to why it has not been adopted wide scale by banking industry is that they cannot manipulate it in the way they can the current fiat system.
From my reading of Tether, it is exactly the type of crypto the banks would love to adopt, but as its underlying structure is fundamentally flawed, it will be exposed and return to zero.
The problem the banks have with bitcoin is that, if they were ever to adopt it, is that they would no longer be able to manipulate markets they way they can now. Hence, no uniform agreement in that sector to blockchain.
Even that statement shows how bizarre this whole thing is. Why on earth would banks want something like Tether?? It is a company based in the British Virgin Islands that print money they claim is backed by actual USD cash reserves. It is nothing. Absolutely nothing. They won't even show where their reserves are held. They sacked their auditor. The printing of tether seems to be strongly correlated to the price of Bitcoin. More seems to be printed when the price falls so it appears as if it being used to prop up the price of Bitcoin which just happens to benefit Bitfinex who just happen to have a number of the same people in charge of both companies. That's if you can find out who is really in charge. And we are not talking about few million of USD here. We are talking hundreds of million. And people think Bitcoin can't be manipulated.
Bitcoin and other crypto currencies could turn out to be the most amazing things ever invented. Blockchain technology might change the world like the internet has. But they could also turn out to be the latest version of the mini disk. Good luck to people who believe and put their money where their mouth but I think I would rather be sitting here in the future wishing I invested rather than wishing I didn't invest.