Yes, blockchain can be combined with manufacturing and service industries. They are about to change the world. Otherwise the blockchain will be a bubble. But the cryptocurrency is not a bubble.
I kinda feel the opposite. I believe cryptocurrency is more likely to be the bubble (as we have seem with many of the ICOs). But the blockchain technology is here to stay due to its immutable, transparent, and automation benefits. Many big companies and banks have already started to patent different applications with blockchain.