If we want to see the blockchain technology massively adopted, no choice to get centralized private blockchains in the future. The adoption will come from companies and so creating their own blockchains, of course, it will be centralized ones. I don't think there is any use to make it public and decentralized for them. Let' say you own an insurance company, why would you make a decentralized blockchain
Yeah. There would be absolutely no reason for these businesses to have a decentralized blockchain if their intentions are to use the blockchain as the private ledger for internal transactions or whatnot. It simply doesn't make any sense.
But we are seeing a trend where governments are issuing their own cryptocurrencies which are pretty much completely controlled by them, and thus, centralized. There are also centralized cryptocurrencies that are coming out and trying to raise funds through ICOs.
These are the centralized blockchains that I think OP is referring to, and they have been becoming a trend recently as I've mentioned as many countries have already started developing them. But I would never touch these, especially if they're being touted as an investment.