There is always a level of competition that anyone tries to play but that competition does not give any room for altcoin to beat bitcoin.
There is already a lot of evidence that we can find about bitcoin's journey that has led it to become the best so that it is enough to show how strong bitcoin is in this space.
When talking about facts, there is also a lot of evidence that can be shown why bitcoin can be the best right now.
ETH is indeed the second coin that has a fundamental level but there is no chance that it can bring down bitcoin.
Without us proving this has happened because bitcoin is still the best asset for any time.
I agree that Bitcoin is most popular cryptocurrency and it is hard for other coins to get more popular against it. We know that Bitcoin has long history and with time it has proven to be strong and widely accepted. Ethereum is on second number but it is still behind Bitcoin in terms of value. Ethereum has its own strengths but it is unlikely to become more popular than Bitcoin soon. Bitcoin is considered best asset because it is rare and secure. Even when market changes it keeps its value almost stable and growing over time which is making it trusted way to store value. Because of these things it is difficult that any other cryptocurrency will become more popular than Bitcoin.