There are jurisdictions with speed limits comparable to ours where enforcement is tough. Think New York, where the usual Interstate ticket threshold is 5mph or 8kmph over the limit, and where roadside ticket lowering is the exceptionand not the norm. The broader general public doesn't get "****** off" at that level of enforcement at all. They just see it as a fact of life and adjust their driving expectations according.
The same thing would happen here over time. For most drivers there is no compelling NEED to drive faster. It's a want for those drivers that they will act on if they think they can get away with it. Nothing more, nothing less. Tougher enforcement would cause some to be disgruntled for a time, and some to be disgruntled forever, but most drivers will simply adjust their driving wants to slide in under the enforcement criteria with barely a second thought.
As for statisticians, like it or not numbers are important when it comes to setting policy. Numbers define an issue in more solidly objective terms and remove the "want" and emotion from an issue. Both laboratory and real world experience shows that incremental increases in crash speed is generally accompanied by exponential increases in crash severity, and with the exponential increase in crash severity comes exponential increases in crash injuries and fatalities.
Look to that German study. Reducing speeds by 1% should have a 4% reduction in road fatalities. Imposing a 120 kmph speed limit on the Autobahan would lead to a 20% reduction in road deaths, or going even further to a 100 kmph speed limit would lead to a 37% reduction in road deaths. That's a fairly significant difference in projected fatalities at 120 kmph speed limits versus 100 kmph speed limits, and that's coming from the experts in the land of the Autobahn.
Now apply those numbers to Ontario with its publicly-health care system. The health care cost repercussions of increased risk of crash are borne not just be the driver who wants to drive faster, and not just by the victims who are run into by that driver should he or she crash, but also by the general taxpayer. The government could simply shiftthat cost back to the insurance companies, but guess what effect that will have on insurance rates. There is no compelling argument in support of high speed limits when you balance in the negatives that would accompany the higher speeds that would result.