I have a lot of respect for Eth but i don't think Eth can outshine BTC when it comes to market cap. The dominance of BTC will be difficult to break bt any coin.
We can not know how the future will come. Even if there is any possibility, it will take a lot of time for the ethereum to defeat the current bitcoin dominance. This power won by btc for years will not be lost in a short time. In fact, when we compare both, ethereum is always taking new steps in development, but on the other hand btc is btc.
Btc will make its own moves and keep its distance from the other projects, there's no doubt that it will move forward and bounce itself back.
ETH might move also but like what you have said BTC is BTC and most of the traders and investors will follow this coin first than following
those alternatives which comes from behind.