The DR is quite correct with what is happening and going to happen with rental aircraft. Insurers in the USA already set the rules....
There have been too many accidents (in all types of aircraft) with people not being current or not getting a correct checkout.
In days of old, each S/E aircraft type required a rating (this is still the case in NZ).
In the USA - Operators will qualify for cheaper insurance as long as renters go through a set course.
I guess the market will decide.