There's no link in your article to any particular long-term research that demonstrates your main point about gamers having such improvements over the ordinary population. If something is that critical to your article, please show it to us or at least state whose research it was. I'm certainly interested in the details, and I'd expect others are as well.
Your argument misses the point of the growing issues of bad posture, early degradation of eyesight and obesity attributed to increasingly sedentary lifestyles (spent gaming or otherwise) and thus not finding time to stand up, exercise and see the world at long distances. If this particular inside-entertainment subculture did truly come to dominate, then I'd argue that it wouldn't just be a factor for the physical improvement for the human race, but also a weakening. Of course, on the intellectual front, you implied the variety of great thinkers and complete idiots in our subculture, which was fair enough.
I enjoyed the piece as sci-fi, though, and it's obvious that you did as well. Writing for fun and getting published must be nice. I'll have to try that here sometime, given an opportunity.