I don't completely agree nor do I completely disagree. BTC has the first-mover advantage and the highest visibility, but many (rightfully, I think) argue that its functionality is older and less efficient. It's no longer true that everything moves through BTC either, given that ETH is now accepted in place of it in many locations. Even if BTC pops right now, many altcoins will continue to trudge on, and I think at the very least ETH will have an independent life of its own given its interesting premises and all its corporate involvement.