Ethereum, being the world's second largest cryptocurrency by market cap, has all the potential of replacing Bitcoin in the future. It's more than just a cryptocurrency, being a platform for the development and execution of smart contracts (aka dApps). With ETH, it's possible to launch alternative cryptocurrencies without the need to start a Blockchain from scratch. It's also possible to use the ETH blockchain for other purposes such as voting, proof of identity, verification of documents, and more. In contrast, Bitcoin's only use is for finance where it cannot be implemented in other areas by its own.
Given all of the benefits Ethereum provides on top of Bitcoin, it makes me wonder whenever it'll be able to replace the pioneer cryptocurrency within the future? As long as, Ethereum keeps progressing in development and mainstream acceptance, it'll be much closer to Bitcoin every step of the way. What are your thoughts?

There's nothing wrong about it. Ethereum has an awesome platform, they are the second largest price and volume as you can see in the market. Ethereum has a possibility to rise to the top but I think as of now nothing can beat the price and volume of bitcoin since it is the most used cryptocurrency than any other coins. There are also lots of projects that are being developed and have their awesome platform but still, the popularity and support is very important. Investors that will help the project to rise.