For me, I don't think that Ethereum can beat Bitcoin as the Number One in the crypto market, it's because Bitcoin is getting more and more bigger each day because there are more investors coming every time and Ethereum still has a lot to improve in their blockchain and their security features.
I think Bitcoin will always be valuable as a store of value, but I think it has limitations as a method of payment because of high fees and long transaction times. For this reason, I think Etherium and some other cryptocurrencies could pass Bitcoin in market cap at some point. I think it will eventually happen as new coins with better features come along.