Something inbetween. Humans might not get extinct, but you and everyone you know (or the next few generations) either will, or will revert to mediaeval way of life at best. Lack of drinking water is no joke.

Same for the rest of the ecosystem. Not everything will die out, even more than just cockroaches will remain. But a lot of wildlife will keep getting destroyed.

Personally I’m expecting a dystopia like we see in cyberpunk stories.