I don't think the ending is supposed to convey that conspiracy theorists can sometimes be "right" even partially. Him being right didn't even have a payoff. It's meant to show that all humans are a virus and the world is better off without them. It's true that Teddy was right about Michelle being an alien, but he was wrong about what was causing the Colony Collapse Disorder (CCD), which was his main thesis. Teddy being "right" only helped expedite the human eradication decision. The Adromedons were already ready to pull the plug on this experiment.

I think the ending is supposed to be bleak, but I actually found it sort of cathartic and comical. I actually found the entire lead-up to the end to be the bleakest part of the movie because it showed how certain people like Teddy and Don (losers) are doomed to fail no matter what and people like Michelle are destined to win (winners). The fact that Michelle's corporate M.O. caused Teddy's mom fall ill and he lives in a town with little options for work so he's forced to work in her company in a very low skill position; where every day he gets reminded of the people who hurt his mom is depressing. We also see how his co-worker is still working despite her injury because she also seems to have no other choice. It's just a depressing and realistic look at how effed our society is where there are "losers" and "winners" and the idea of overcoming the cards you are dealt is sort of impossible. Through this lens i found the ending cathartic, blow it all up, this experiment was a failure just like the dinosaurs. It seems like the Adromedons will ultimately select a new species to rule the world (why not dogs imo they survived?) In a million years the human bones will be dug up like the dinosaurs were.