It's not a good thing, because bankers will not hesitate to manipulate things more than they are.
But the article says that this IMMO is just a private, inner blockchain for Rothschild family, to count and manage enormous riches they obtained over the years. Paragraph later they speculate that it will be entangled with real estate but I think that it is still with connection to private belongings of said family, not for commercial use.
Either way, we can't just say: STOP Mr Bankster, you are not allowed in to our world!
If they want this technology, they will have it. All we can do is to vote with our wallets. Just don't buy it.
BTW imagine how rich one has to be to take in to consideration the usage of blockchain accounting... crazy