I'm a bit over 3/4 through MotF, which is quite a read. Francis Fukuyama reviews that and Neal Stevenson's Termination Shock (which I've not yet read. And his principle criticism of Robinson is that the book is far too optimistic:
While there are some dramatic responses in the book, like the kidnapping of the Davos crowd and assassinations of oil executives, the book imagines what is in a way the best possible future outcomes. The eco-terrorist campaign and attacks on airliners do not trigger massive repression (people, it appears, don’t mind giving up air travel); five million people march spontaneously on Beijing and compel the CCP to speed up the energy transition; the crisis becomes the occasion to implement universal basic income around the world with no adverse consequences for the economy apart from a six-month recession; and the various attempts at geo-engineering all work as planned and produce no unanticipated effects.
https://www.americanpurpose.com/blog/fukuyama/two-futures/
I'd make a similar response to Fukuyama as to you: KSR wrote a specific book with a specific point in mind: if you want a survivable outcome, then events would need to play out largely as he suggests. KSR isn't arguing that this is the probable or plausible path, but that it's the necessary one.
(It's also very much a vehicle for advancing KSR's political views, which is another discussion. That said, as a minority opinion, I think the airing is well-deserved.)