Unfortunately no kind of testing is a filter for keeping riff raff out.
It has done that very thing, for the most part, for several decades!
However, I do question the term "riff raff." I, by no means consider anyone riff raff but we are seeing an influx of people who are OK with turning ham radio into another CB fiasco.
The first thing they do is minimize the need for the existing rules, regulations, technical qualifications, customs and purpose of ham radio.
Ham radio is the only hobby controlled by a federal entity. It is a technical hobby where the federal government encourages participants to build, experiment and modify their equipment. They're the only communicators, with the exception of the military, that use VFO control of their transmitting equipment.
Speaking of surgeons, think of how many you have heard of who have butchered people up, or are known to be drug addicts since they have access to medicine - look at how much testing and training THEY went through.
Sure, they're are exceptions to everything, and we admit we have a bunch of a..holes on 75 and 20m that you can categorize with these "surgeons", but all in all this statement is BS.