A good article, but I'm wary of the idea that you can solve the problem by spending just as much time, only on a different kind of solo computer game.

Solo computer games are fun for recreation* but until the AI in them starts approaching humans levels they will never challenge you the way real people can. Learning a martial art, studying math/computer science or playing a team sport (even if it's a LAN strategy game) seems to me a much better way to build muscles (physical, mental, social).

*but playing them too much is probably a sign of akrasia... http://lesswrong.com/lw/15w/experiential_pica/

However games which train actual working memory (e.g. Dual N-Back) may be an exception.