You're actually correct, it's a good faultline that comes up in a few discussions about the average lifespan of a performer for that exact reason: it's still a fairly recent industry in regards to the performers who gained popularity from the technological ease-of-access to porn.

However, there is little attempt from the establishment to fund extensive research into the impact(s) it has on the performers/society at large because there will never be a positive-enough outcome they could spin that would outweigh or justify the negative side-effects it entails for both those involved in producing it and those involved in consuming it.