So this is a very bad reason
Altavista were the first search engine until Google came....
That's the only thing that makes bitcoin so worthwhile ?
No. Being the first is what got bitcoin going. Having the set of attributes that bitcoin has (which I am not going to list and can be found elsewhere) is what has people trusting in it. It has momentum and trust of users. If another identical coin appears it does not have the value that an established trusted coin has. There is no reason for anyone to switch. If another coin with superior attributes appears... well we will see what happens when that occurs. Most likely, however, such a superior coin will be an improved bitcoin (i.e. compatible).