I think a sufficient “Doom Scenario” would be an AI that is widespread and capable enough to poison the well of knowledge we ask it to regurgitate back at us out of laziness.
That’s pretty much social media today.
You best start believing in societal collapse stories, cause you’re in one.
Well, there’s a complete lack of imagination for you.
Meanwhile, the power grid, traffic controls, and myriad infrastructure & adjacent internet-connected software will be using AI, if not already.
I’m pretty sure all of the things you listed run on Pentium 4s.
There will be more than enough humans willing to help AI kill the others first, before realizing that “kill all humans” actually meant “kill all humans”.
Still need humans for that sweet, sweet maintenance.
Temporarily.