I see this a lot, and I think it's sort of naive. Nature itself is doomed due to the way the universe works. It's also far more brutal and arbitrary than we could imagine being. The only way to even have a chance at avoiding the doom that "nature" is facing is for something to evolve that can manipulate and forestall this inevitability.

I don't know if humanity is what can do that, and likely nobody knows. But nature is not going to survive either once you broaden the time horizon a bit.

> Nature will be better off once it happens.

As long as "it" happens before we poison or otherwise harm our planet beyond some "tipping point" after which Earth becomes "inhospitable" to most/all "complex" life in general.