The premise of the article. I don't believe this for a second.
Imagine the delusional hopefulness one would have to have to believe that something will, for eternity, not be superseded. Nothing in the history of humanity, or even life, remains unsurpassed from it's inception. Yet somehow this thing is unbeatable.
There are cryptocurrencies out there that meet all of the criteria that is laid forth in the article as the reason for this conclusion. True, most, I'd say almost all, don't, as the article does point out, but some do. So what's the secret sauce that makes those currencies incapable if it isn't simply these criteria laid out? Is it magic? Is it some emergent property we have yet to comprehend? If so, why not say it in the article? No, the article says those traits are all you need to draw that conclusion and yet, there's no compelling reason why that's the case. It's hand waving.
The criteria not mentioned is network effects. But we know, network effects are not an insurmountable obstacle. So the conclusion still does not follow. Those criteria are a must, and network effects make it incredibly difficult to supersede bitcoin, but not impossible.
I say the opposite: bitcoin's demise is inevitable. Not because I don't like bitcoin, don't believe in it, think it's a scam. I am a bitcoiner. But because nothing lasts forever, bitcoin isn't perfect, and there are people out there trying to make it better that aren't getting their PRs merged and/or making it to consensus to become a part of the network software.
I can think of at least one cryptocurrency that is better than bitcoin in every way, that meets all the criteria in the article, but just doesn't have the network effects. And to surmount that, the technical superiority, the benefit to the user to switch has to be so compelling that network effect diminishes. It's not enough to be marginally better, it has to be astronomically better. Maybe that one I have in mind doesn't have that, but you can bet that one will be made that will have that eventually.