Sure some will fail...in fact many will fail.

The banksters arent establishing blockchain in my opinion...they are using the technology to establish sahred databases, which, to me, are not revolutionary. They are not decentralized or are they public. The fact that the data is blocked and chained means little since it is them who control it.

As for ETH, I believe, like BTC, they will overcome their problems. I do feel more confident in BTC over ETH ironically since BTC has the name. ETH has too much development to go under...it will survive. That is the thing about blockchains, they are networks and as long as people are using them, they not only will survive but have value. Now how much that is remains to be seen. EOS could present a problem for ETH which could knock it down to $100 a token...we shall see.

The big issues with the ETH, BTC, LTC is they are still dealing with scaling issues although ETH says they are going away from a proof of work concept.