It’s still useful but the issue always was it’s expensive for what it does so that’s why it was used underground since that has value of it’s own. There is arguments that it’s actually more efficient than current systems so there is an obvious takeaway of being, why don’t we have money that doesn’t cost a lot of maintain. The answer is the scary part.
Pretty much the same in any country with a majority ethnic population. They lived in an area for hundreds, sometimes fighting wars for it, and so it’s not easy to have them give away their lands to people who are completely different down to the religion and imagine a completely different future. America is being pushed to have a civil war over it though likely to other countries interest. One that is very ethnically populated mind you.