You are probably right, but wouldn't any technology which actually has a chance of working, also have the property that a small seeding might have the chance of "taking hold" and working wether we remember to continue on it or not?

To be clear, I mean if someone drops a bunch of microbes, only once, and not all of them die but slowly start to mix and live in the atmosphere, wouldn't they over millennia, very slowly but also very unstoppably, eat until everything they want to eat is eaten?