i disagree. bitcoin can be "dethroned" and replaced. if the altcoins spend the money they are spending on advertising and pump and dumps they can eventually create something good.
but instead we only have shitcoins, for instance ethereum is the best example. it is only advertisement and empty promises while it is getting pumped and dumped. people keep competing it with bitcoin and consider it bitcoin's competition where in fact it is not even a currency to compete with bitcoin!!!