The first mover advantage can be huge but with this feature alone I don't think Bitcoin can be able to survive as it is now...with its value continually rising and always coming back even if it had been proclaimed to be dead over and over again. I am not so sure but I think there seems to have a certain magic with Bitcoin that much better cryptocurrency can not rival. In any marketplace not just in cryptocurrency there will always be better products but their acceptance is not that good compared to products that have already established a strong foothold and captured market. Being first can be a big advantage but it is not always enough, of course. Now, the same can be said of Bitcoin's competitors: being better may not be always enough. Ultimately, everything boils down to acceptance and that sense of trust that it can be more valuable down the road.