Comments and posts should be constructive.
You vaguely reference supply and demand, and if anything it's pretty clear that there is a large demand for the 300mm f/2.8 IS series but that is certainly offset by the supply - for the EOS mount you can just about adopt monopoly pricing. There has been at least one other 300mm f/2.8 option for a long while now (the Sigma 120-300mm f/2.8 in its OS and non-OS variants) which is very nearly as good (edit: not sure what I could say in comparison to, not having used it - think I mean in comparison to their 120-300mm).
So, in terms of "constructive criticism," maybe Canon had better get competitive. Or perhaps the 300mm f/2.8 is that much better than the zoom (it does appear to be with a teleconverter; otherwise, not much of a difference you can point to) and Canon has no wish to compete on a price basis. I assume the latter option is what everybody assumes to be true, but at $3100 the Sigma is almost all the way there - I have to wonder what its optical qualities would be like if it were a prime instead of a zoom, and even Michael Reichmann (who retired the 100-400 as he found it was limiting new cameras - back in 2002!) called it
"a world-class lens." Sigma's own 300/2.8 prime is quite old (non-OS) and just a bit less expensive than the new zoom, perhaps a sign that they want just one lens to fit in this category (similar to Canon's reasoning, I'd guess).
Often there's some nuggets of truth in even a post that looks like simple sour grapes.
Being the obsessive aspie that I am, I applied your estimated fractions to the number of EF lenses actually made and calculated that Canon have made 0.007 supertele primes!
I kind of eyeballed it and thought it would come out far too low as well. Thanks for running the numbers
To neuro's credit, magnitude changes of decimal place add up faster than one might expect.
Ironically, according to Neuro's numbers all of the Canon lenses I own belong to the last 5% group (not including superteles of course), except perhaps the EF 28-90mm III film Rebel kit zoom. I think that the number of primes out there in these groups could be higher than 5% of the total makeup, but I do see a lot of 55-250 and 70-300mm zooms out there being sold as part of DSLR kits (or are trying to be sold).