The problem here is that many of those stunt driving charges are plead out to minor HTA offences (1-2 points). Even drinking and driving charges are often plead down to careless.
The consequences in those cases are not meaningful. The Crown has to plead these down because they are not able to go to trial for them unless things change drastically at the court house. And if it were to go to trial, there needs to be promise that the consequences are going to be severe.
The government knows that they can not control this. So they make laws that allow them to be the judge right then and there, rather than let many of those cases get lowered/tossed, etc.
I think the conviction rate on these would be quiet high, but for the most part, 90-95% are plead down.
Personally, I don't have an opinion on this. I would just not do 50 over on the highway, or 40 over on the roads. I think this law is ok. What I really dislike are the speed cameras, thats the government going after hard working tax payers and its bs.