Sorry if this is a bit blunt, but I'm mystified by the description of that video as "sober and rational". I'm not a Linux fanboy at all -- I happily use my Mac and don't even own a Linux computer besides my Raspberry Pi -- and in fact I was looking forward to digging into that talk, but it's just a guy rambling extraordinarily slowly about a bunch of half-points for an hour.
The parts that I managed to endure were these:
"Some Linux figures are being cancelled, like Richard Stallman." Silence the pianos and with muffled drum... oh wait, actually, systemd will probably keep running and crons will keep firing.
"Linux companies undergoing changes." Where's Heraclitus when you need him?
"Linux complexity increasing rapidly." He counts 2m lines of code added this year. But it's mostly drivers, and anyway this number has been trending downwards for a decade from what I can see (https://www.pingdom.com/wp-content/uploads/2012/04/linux-ker...).
"All Linux events are cancelled." Hmm, far be it from me to say, but I faintly recall that there was something besides Linux which might account for that.
"Google building Linux replacement." Google not building Linux replacement, Google building operating system.
"No operating system stays dominant forever." Linux is indeed not Ozymandias, sitting alone at the top of all creation, outside of space and time ... but I'm not sure how that means it sucks.
I wanted to like this, I honestly did, but the arguments are so dreadful that it feels like a deleted scene from one of Plato's dialogues. And Lord almighty he could have got to the point - such as it was - in much less than an hour.