The next question is which traits to do you choose and the next question is which traits are better, because choices will imply ordering, and then you open a big can of worms that last time killed millions of people. So maybe there's other ways to avoid doom that didn't create doom last time we went down the path.

Unpopular opinion for obvious reasons, but probably the only realistic one apart from just witnessing one extinction after another. Pollution and climate change aint going anywhere until we elevate whole world to the level of say western Europe.

But since we humans are pretty arrogant with our wisdom and lack long term patience, I can see many ways where well-intended meddling can end up in catastrophe overall.