All coins are flawed some way, but the question is, what kind of flaw it has?
Well, technically all coins aren't 'garbage' (seems the user used two adjectives). I'd say that most of them are garbage, and that a fair number runs on outdated/insecure codebase.
For bitcoin, the worst case scenario is this scaling problem.
It's really just a matter of time before these boundaries get pushed.
hard fork(eth: --oppose-dao-fork) = intentional split = mitosis
consensus change = majority upgrade = gene therapy
-snip-
What's up with so many analogies recently regarding hard forks?