This discussion has been going on for a long time if Ethereum may become greater then Bitcoin, back in the day everyone was talking about the flippening (Ethereum overtaking Bitcoin) and that was when Ethereum was around 3$ per Ethereum.
I don't think Ethereum can replace/become the number one Cryptocurrency anymore, Bitcoin will always be the Mother of all Cryptocurrency and it will be hard to beat.
But when Ethereum is going to Ethereum 2.0 it will be interesting to see what it will do with the price, also Ethereum is not fully utilized yet and when it will be used for all that it can do.
That will still take time and Ethereum is still being improved with in 2020 some good improvements, one of them being that smart contracts can be written in multiple coding languages not only solidity.
That's certainly true, mate. You can't beat something that started it all in the first place. Bitcoin, being the originator of Blockchain technology, has been a trusted cryptocurrency over the years. It is that trust which has prevented it from falling any lower in market capitalization. The Ethereum blockchain, although superior than Bitcoin in its technical aspects, has a lot to catch up before it becomes a real threat (if any) to Bitcoin. I'd say that the world's second-largest cryptocurrency by market cap (ETH) serves more as a complement to the main Bitcoin blockchain than anything else.
The real deal would be the transition from ETH's current PoW algorithm to PoS. Things will become interesting by then, as people will be hoarding more the cryptocurrency than they would ever sell. This could allow ETH's prices to rise like never before, due to the increased demand of the cryptocurrency across the market. While market cap will also rise, I don't think Ethereum will be able to "flip" Bitcoin anytime soon. The gap between both cryptocurrencies' market caps is very wide.
According to my calculations, Ethereum would need to be worth more than $1,568.15 per coin with the current circulating supply of 109,499,251 ETH to be able to surpass Bitcoin in market cap. That is, of course, if Bitcoin remains at its current price of $9,439.25 per coin. Considering that ETH and other altcoins rise in price once Bitcoin goes to the moon, it's practically impossible for ETH to become the largest cryptocurrency in the world. Despite this, Ethereum is bound to bring many excitement to the crypto space. The diversity of programming languages, greater scalability, increased privacy, and more, would make Ethereum one of the best blockchain networks in the world alongside Bitcoin. Combining both BTC and ETH, you'll get a massive ecosystem that gives banking to the unbanked without the need to rely on third parties (governments, banks, etc.) ever. And that's what matters after all. Just my opinion