I'm curious about where you got these numbers from?
http://www.rcmp-grc.gc.ca/cfp-pcaf/facts-faits/index-eng.htm
Interesting, the count of license owners by category of license is not published on this page any more... Last they published it, there were about 38,000. That number, or the new (there are fewer every day) count may be somewhere else on their website, or available upon request. Statistics are fun.
I would probably subtract from the 185,000 registered prohibited firearms the other prohib categories, 12.3 etc. (much smaller numbers than 12.6) fewer than 5,000, again back when there was more detail. There are also probably institutional (Police, Military) prohibited firearms included in this total, but that's my vague recollection from a conversation with someone in the Program some time ago. 30,000? Just off the top, Glock 19/26/23/27 (plainclothes issue in many agencies) and SIG P225/P228, and many other models where barrel length is no issue for Law Enforcement or Military use. Museums, business licensees, and no doubt others I haven't thought of will account for some 12.6 firearms that are not (under existing law) ever going to become available to individuals.
Any recollection, or any of these statistics, may or may not be accurate.
If we imagine that there are still at least 30,000 12.6 holders and at least 150,000 available prohibs in private hands, we get a nice round number of 5 per license holder as an average. There, a number you can compare yourself to!
There are no statistics shown for R-PAL holders do divide the 726,000 restricted firearms by ... but it will be fewer than half of all PAL holders, I'm sure. If someone has the time to find an publish the link to the number of license holders, I'd appreciate it!
There are some young guys with 12.6 PALs, plus of course us healthy old guys who intend to be here well past 100, still enjoying their guns, so Liberal and NDP disasters notwithstanding, we can debate the value of 12.6 firearms for at least the next 40 years.