Yes I agree with this one. If those people once knew all about ETH or other altcoins how they works, their technology, those projects of them, teams and active commnunity that's the time new people will realize that ETH and other altcoins are more worth of their money for investment because they have a real use in this world in the future.
Yeah, the reason why btc it is in the top cause of his primordialness. Although alts blockchains based on btc's, but they are improved, and when it will comes to most of people heads, top alts will bit the bitcoin in capitalization. For now you can say that if btc will die, other alts will die to, because btc for now is the main currency in the cryptoworld, and with it all other coins will move down or top, no matter. But in the closer future it will change for sure.