The iPad 3 was a mistake and everyone knows it. iPad 4 is a minor patch work job to fix that somewhat. iPad 5 will be the best big iPad ever. It will be thinner and lighter than the 3/4.
So the bottom line is, iPad mini is not getting a retina display for a couple more generations at least. People need to start accepting that.
I don't think the 3 was a mistake, but it wasn't quite what I was hoping for either. I actually returned mine and got my money back and stuck with my iPad 2. After using them side by side for a week, the 2 was good enough.
As for the mini with Retina. Not sure your arguments are quite correct, as others have stated. If not mini2 then definitely mini 3. It will happen and probably next year.