For me most of the coins will fail in the most obvious question: What problem do your coin will solve?
I read a lot of threads and whitepapers but it's a shame, they don't have a simple explanation why we have to believe in the project, how people are going to use it and the rest is only words, just to gain some money...
I fully agree, I think that at the moment of the answer, what problem your coin would solve, many would not know how to respond, I believe that 100% of the currencies that we have today 80% serve almost nothing, only increase the number of currencies already created.
Absolutely, even with a fantastic use case many projects and companies fail due to many reasons. Usually the team lacks enough experience, skill and knowledge to overcome problems.