In a few years there'll only one Bitcoin. Only one should prevail and we all know which one it will be
Agree entirely that only one should prevail, and only one might end up being relevant but I doubt the others will just disappear, they'll always be hanging around in bitcoin's shadow and stealing away any attention and money that they can.
I tend to disagree with this view
Though I understand your reasoning (and where it fails). Basically, you assume that things will go on as before (which is kind of natural assumption). But they won't. During the dotcom era there were many thousands of startups which were all fake and bogus, just like the majority of shitcoins today and yesterday. They are all long gone, and only a few valid and legit ones have survived (think Amazon here). In a nutshell, I expect all these coins to be gone in a couple of years. Technically, they may not be gone as in delisted from everywhere and abandoned altogether, but they will definitely be no longer relevant in the sense you mean it. Bitcoin is a survivor, Litecoin is a survivor, even fuckin' Dogecoin is a survivor, but the rest of the pack are not going to make it