This is why I think the proper crypto currencies are backed by another functional use instead of "just coins." (e.g. Ethereum vs. Bitcoin)—one is a useful Turing-complete machine; the other only exists to send coins.

Bitcoin will probably always outshine the other "just coins" because it was the first. Why get another coin if this one works fine for monetary transactions?

Similarly with the functional ones: Ethereum will probably always outshine the other "Global Turing Machines" because it was the first. We don't really need another one—assuming it can adapt to changes in efficiency with hard-forks as needed.

The rest of them really ought to provide another service underneath to become valuable.