I think different blockchains for specific markets makes the market more competitive. All these competitiveness benefits us consumers in the end. Besides, if a blockchain survives after its ICO, it will die after a year without a strong project to back it up. It is a natural dynamic for weak ICOs to weed oht the weak ones.
Yeah you are right but I think it would not be possible because people are not ready for one blockchain and when there is more than one technology, it would be difficult to claim in the market because of the peoples choice. I think one blockchain technology is enough for the whole world. No need for many technologies because of the confusion in selection.