Ethereum has great prospects, though it may be gradually updating its 2.0 version but then it has proven beyond reasonable doubt that it has the potentials of appreciating in value and operations. To what magnitude of update and upgrade it can attain before fulfilling such target, we are yet to known but then it can if it get upscaled. In all of its features
The 2.0 version of Ethereum might bring a huge boost in price, as people will regain the sentiment of FOMO. However, it looks very unlikely that ETH will replace Bitcoin anytime soon as there is a huge difference in market cap between both cryptocurrencies. In terms of technicalities, Ethereum is superior as it not only provides a means of payment (like Bitcoin) but also other applications far beyond reach. You can do all sorts of stuff with Ethereum, while that's not the case with Bitcoin. In this regard, it's believed that "Ether" will experience an ever-growing demand over time.
Once Ethereum scales towards millions of transactions per second, then its dominance on the market will rise without a doubt. However, I'm afraid that Bitcoin will remain as the leading cryptocurrency because many people trust it over alternative cryptocurrencies. After all, Bitcoin has been tried and tested over the years as the most secure Blockchain to date. Which is why, no other cryptocurrency has been able to take Bitcoin's place as the world's largest cryptocurrency by market cap.
Nonetheless, anything could happen in the future as crypto is highly volatile. At times, Ethereum will be in its ATHs while Bitcoin will be depressed in price and vice versa. What matters is that both cryptocurrencies will be here to stay for a very long time. Just my opinion