what is so good about eth?... people know cryptocurrency because of bitcoin.
Two very valid points have been made here. Eth was good basically because of smart contracts and dapp creation, but the real question still remains what 'is' so good about eth [now]. There are many smart contract platforms now rivaling ethereum and that's not mentioning the multiple PoS solutions being paraded on the open market. So, except ethereum's new solutions are epic, it will just end up being another shitcoin. And your last argument about people knowing cryptocurrency because of bitcoin couldn't be truer. Bitcoin makes more headlines than any other cryptocurrency and as a matter of fact, everyone is more concerned about the price of BTC and the minor or major changes coming (to include halving), to help determine the direction of the market.
More so, the asymmetric market dominance (bitcoin vs all other coins), kinda makes it hard for ethereum to compete.