I'd say many of the blockchain projects will fail, simply because majorities are just a copy of one another. Some projects lack vision, others just cannot deliver when flushed with cash. It's a matter of time before competition weed out the weakest link. Now, does that mean all projects will fail? I don't think so. It just mean that we have to research and place our best bet with team with solid roadmaps which actually solve a big enough real world problem.