The main thing is that you can't really know the long-term effects of changing the biodiversity on the planet. It's fairly common that extensive plant breading is producing plants that are less healthy, more prone to diseases. That's why "pesticides" is an argument, but it's not the main argument. What happens when these tomato genes spread too heavily and you will not even be able to produce tomatoes with just soil, water and sun? What if they spread to other plants? (Plants to cross-pollinate).
> The main thing is that you can't really know the long-term effects of changing the biodiversity on the planet.
Has the planet itself not been doing this for quite a long time already? I think your question would be better framed as not “changing” but “accelerating” and I think that is indeed a valid question. I’m just not sure I agree it will end with non viable crops.
