Bitcoin's biggest competitor is Dash & Monero. Both of these coins do everything Bitcoin does & more in a far better, faster and anonymous way.
If Ethereum increases with let's say 100% in one month, where Bitcoin remains stagnant, Ethereum according to them is better, plus that its market cap is another indication that Bitcoin will get replaced.
It's a twisted way of thinking, but that's how things go here. People are blinded by their own greed and don't see what is really important to focus on. Market caps and pumps mean absolutely nothing.
Dash and Monero are doing their thing, but even these coins are no real competitor. They offer great anonymity features, but people are still using these coins for speculation purposes, and that's basically it.