I think they're trying to work out how to security check people who are not actually receiving training, but who simply want to turn up, do a BFR / Flight Check and rent a plane.
My guess is that they will come up with a way, since the GA industry is not going to be happy with more measures which will reduce their income.
What it will probably prevent, or at least make more difficult, is what I used to do which was turn up on spec and simply rent a plane for a day between business meetings..
