The really boring dystopia of unsustainable production. We've been producing a culture tied to unsustainable labour practices, fossil fuels and materials. We're racing down the road toward a dead end and calling it progress.

Unsustainable means "cannot be sustained", rather than the more commonly accepted "not hippy-dippy green enough".

Cheap technology, plastic everything, big box stores full of food and products from overseas, etc. These will all go away, because they cannot be sustained.

With luck, it can be a slow wasting away of the things we've taken for granted. We may have time to pick and choose which technologies to save that could help maintain a similar quality of life (plastics for healthcare, permacomputing, renewable energy infra, advanced agricultural techniques).

Without luck... we could lose a sizable percentage of the population is a very short period of time.

This is inseperable from political collapse, though. It's hard to imagine our societies losing a hundred years of "progress" without a ton of people embracing authoritarian and reactionary politics, civil war, genocide, etc.

Most likely, humanity is going to exterminate itself through political instability (haves versus have-nots) and with political collapse, end its ability to have functional economies, returning us to subsistence hunter-gatherer with small holding farms level.