Jurassic narratives notwithstanding, unsure if this is a real problem. If you have a yeast that will only survive under narrow unnatural circumstances, I would expect freeing it into the wild with natural circumstances means it dies - not uses nature to find a way to destroy the world as a form of poetic justice for ever having been created.
on edit: my confusion stems from being the first to reference anything Jurassic in the conversation, so you sound somewhat accusatory.