Bitcoin has a current lead in attention and investment. Even if a better cryptocoin is devised, by the time it's proven its advantages, Bitcoin could adapt them.
Also, in order to appeal to the proven Bitcoin audience, new cryptocoins might in fact attempt to be complementary to their 'older brother' Bitcoin -- fix some of the issues in certain domains, but interoperate. (They might even find it useful to make some of their initial distribution to exactly the set of Bitcoin holders, as a starting gift.)
Also, in order to appeal to the proven Bitcoin audience, new cryptocoins might in fact attempt to be complementary to their 'older brother' Bitcoin -- fix some of the issues in certain domains, but interoperate. (They might even find it useful to make some of their initial distribution to exactly the set of Bitcoin holders, as a starting gift.)