Over regulation is the killer for drop out rates.
We all survived for decades prior to Biennial reviews, 90 day rules, annual MEP tests etc, all of which have brought no safety benefit and the increased cost and hassle simply drive people away from GA.
An earlier poster said why have medicals? The NPPL medical declaration has proved its worth (but is now under threat)
I am inclined to agree that the medical contribution to deaths and fatalities is minute, and you stand just as much chance of a heart attack in a car on the motorway where the consequences would more likely kill or injur far more people.
The best possible medical precaution is a natural sense of self preservation.
Trouble is, under EASA things are only going to get worse.