So...you are arguing that a popular opinion or claim is the sign of someone who should be listened to?
No. I didn't say anything remotely like that.
folks like Dr. Ehrlich were proclaiming the Great Dieoff by the end of the 1980's.
Dr. Ehrlich was giving a warning, rather than making a prediction. He was saying that population would be a major issue if there weren't measures taken to control it. Measures were actually taken to reduce the number of births, so the scenario he warned about did not happen. If there had been no Dr. Ehrlich and others like him, then the scenarios he worried about would have been far more likely to happen.
I'm tired of people that confuse forecasting with fortune-telling. I don't know how familiar you are with science-fiction, but you shouldn't conflate Hari Seldon (the academic of Foundation that has social formulas to predict the future, and his formulas contain several scenarios and need to be adjusted depending on what actually happens) and Paul Atreides (the guy that gets mystical visions of the future in Dune, and the visions happen exactly as he saw them).
Of course, if to you "exactly" means "within a century or two", we can fit all kinds of folks under the credibility umbrella.
No, but it does mean "within a decade or two", which is as long as historians usually give, but less than you seem willing to give people.
What is your opinion on it of independent researchers, versus the less independent kind? I understand the advantages you have mentioned, what would you say are the top disadvantages? Budgets, or data, or just getting your work published?
I don't give a flying F whether a researcher is independent or not, I care whether the research seems to be well done, makes sense, and it's about an important issue, as opposed to one that somebody in power has decided that people should pay attention to. I wish other people did the same, but that is obviously not the case.
As an independent researcher myself, getting work published hasn't been too easy, mostly because I'm not familiar with the correct way of writing papers. But it hasn't stopped me getting work published or cited. My problem number one is that I don't have an awful lot of time to dedicate to research, and even less to attempt to compete in getting interest with people that have a lot of time.
In any case, even good professional researchers have trouble these days with credibility on issues that really ought to have no difficulties at all, like climate change or the current covid pandemic. To me, that proves that credibility itself is a problem these days. Lots of people have a lot of the wrong notions when it comes to who to believe.