I don't want to diminish the importance of a paradigm shift in how regulators treat various chemicals, but I don't think this will be anywhere near as severe and immediate threat as climate change.
Ultimately, if there is a substantial pool of people who's fertility is not adversely impacted by some yet to be identified chemical, then it will be those people who's genes will pass on. Within a generation we as a species will have developed resistance to at least the impact on fertility by some unregulated chemical.