While certainly one must agree with Ms. McGonigal—or indeed with Mary Poppins—that there is an element of fun to every job that must be done and if you find the fun, then—snap!—the job's a game, the possibilities seem to me fairly limited. As Tom Sawyer learned, "work consists of whatever a body is obliged to do, and . . . play consists of whatever a body is not obliged to do." If ever we're all dragooned into "playing" for the dreary objectives of utopian dreamers, the fun will go out of gaming very quickly.
While I largely agree with Mr. Klavan here, I think he's missing places where this already happens: the pilots of UAVs may not be playing a game, but they're using a lot of the same skills, even more so than pilots who first learned to fly on computer sims. He's also ignoring the rather playful futures markets based around predicting political events like elections. And finally, there's things like this:
I think you can turn Mr. Klavan's objection on its head, and arrive at a more interesting truth: things we don't need to be forced or bribed to do can be called play. Even if they are, in spite of all that, good for us.