you are probably right it is doomed to fail but not for the reason you mentioned.

imho here is why

1. reliance on internet. if some global cataclysm happens it might dissolve. for example what if governments start to tax any traffic that goes across the border? or something similar happens.

2. no solution for growth. there is no even talk about getting rid of having to store all the transaction on each node's medium. how can it grow when there is no space to grow into?

3. big players will never adopt bitcoin because they will never rely on a handful of individuals who control the source code. even though adepts claim bitcoin to be decentralized, most (all?) crysises were solved by centralized authority that de-facto controls the source code emission.