Yes, things are bad. I don’t think that painting the bleakest, most depressing mental image possible is good for me though.
Furthermore it's probably wrong, too. Just after my mom finished school, some people were talking about how the number of diabetics is rapidly rising so that soon there would not be enough land to raise all the pigs required to get the insulin.
This was just before synthetic insulin was invented.
I read most of it (I would have preferred study links so I could look at the uncertainties but whatevs) and it basically just said, everything's fucked and our only hope is to go back to small scale agriculture (which would require massive, massive population loss).
Like, the next century is gonna be touch and go for humanity (certainly at our current levels of technological sophistication) but just saying we're doomed is entirely unhelpful.