In my opinion it will take a lot to dethrown Bitcoin. Even if Bitcoin doesn't have the market cap it will still be the one that's talked about.
I dissagree, as you see the bitcoin is falling and soon ETH will be the number one on coinmarketcap, it mean that trands has changed.
Ethereum is for fooling people. It is a grand concept, but its not capable.
It's follow up Cardano will address the issues, well that is what they like to do.
And already stating it as important as Google is today, the Google for cryptocurrencies.
It will be a hard fight, money will clash at its best, and we all wanna see Bitcoin firing up its booster aka lightning network,
and how high the stars really get they are grabbing for.