Well, this is an increasingly amazing situation.
I have to admit that I may have been much mistaken about this. I had thought Meltdown/Spectre was likely to be a Y2K-type scam, as it seemed to have all the trademarks of one, but then it now seems to have been turned into some kind of a slow-motion trainwreck or farce/fiasco. A sort of comedy of errors.
To protect system stability, I blocked updates to Windows 10 over two weeks ago anyway. Hopefully, it will eventually all calm down to something more sane before too long.