alt Hacker NewsThe real test is the creation rate for those projects.
From your list, I think most were started 15-20+ years ago[1] so your argument isn't contradicting the original point.
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[1] OSM, Fandom and TV Tropes were started 22 years ago. Wikipedia itself was started 25 years ago.
The food shelf I volunteered at yesterday is a lot more than 20 years old. There'll probably not be another Wikipedia, because we already have Wikipedia. There's no point in having a second. Assembly for other things listed. We have one. Why would we need a second one to do that?
I don't know what the future will be, but the future people who live in it will know and they're going to do something. I can say that with confidence, even without knowing exactly what they're going to do.
edit: grammar - see reply for old/wrong version.