I'm in the market for a new Mini Clubman. I want a manual, but my Dad is full of doom and gloom about the resale potential of a manual in the "everyone wants auto" market. I am of the opinion that Minis appeal to car purists and they'll want the manual, and I also want my son to learn in a manual, as it's a life skill.
It’s not like the old days when Mini Coopers did appeal the purists and a manual was the only thing to have, today’s Mini buyers a less purists than fashion followers. Although I would prefer a manual for the fun of driving it, most buyers would prefer an auto and that would affect the resale of your car should you choose a manual. I do agree with you that it’s a good idea for your son to learn to drive a manual.