Let's concentrate on the potentially dangerous part of `aerotoxicity': from all the reports, it seems to be ONLY engine oil contamination of cabin air.
Organophosphate components of turbine oil are essential to ensure the extreme reliability, longevity (and thus safety) of engines; however, they are very toxic to the nervous system. Nothing else that would get into cabin air is anything like as nasty.
Exposure of this type of material for a large crowd of punters can be found in farmers using sheep dip, and led to very nasty long-term consequences. Sheep farmers did effectively bathe in the stuff, though, and the concentrations of toxic compounds were higher (since the insecticide was the main ingredient). Farmers didn't however have to worry too much about losing high levels of concentration at work.
Active study of the levels and long-term exposure seems to be justified. There's a large number of former flyers that can be used in these studies. They all have excellent career-long medical histories available, and a good history of hours flown per type.
The move to `more electric' architectures, and pressing for improvements in the inspection, performance and lifetime of oil seals would also seem to be a sensible precaution.