in my opinion the emergence of new coins is not a problem, but it is the problem of new coins that are detrimental to someone, and I don't think there is an excessive impact on the emergence of new coins for bitcoin.
The impact of new coins to be detrimental would only depend on how much people are drinking into the koolaid and bullshit propaganda of that team. Majority of them dont have any goal other than amassing money from investors and landing up in a stagnant state when market crashes. Thats what makes people more suspicious of what their hard earned money was actually being used for in the name of having invested that in some "bitcoin 2.0"
Honestly, I don't trust the existence of new coins these days. Based on my experience, they will just bloom for days but fades in just a short period of time. I want to get rid of shitcoins so I would only stick to well-established coins. I wish that the market would do coin cleansing to remove all the shitcoins listed.
You can get rid of shitcoins if you sell them - its as simple as pressing a sell button order. But I know that most people will falter here because they have that voice in the back of the mind rehashing that same BS pumping propaganda.