I feel like society really is asking that we pick one thing and specialize in it for our entire lives. And by the time we approach the ends of our lives, I fear that our brains will no longer be plastic enough to pick up new skills and concepts that are dramatically different. If that is close to the truth, it is really depressing.
If I were to pick an answer based on good strategy considering... the traits that have emerged from my little meat body, I'd pick physics or neuroscience. I'd be so tempted to pick other stuff though... I wish I knew more about computers and economics. I wish I knew more about math, I wish I could read all the literature and watch all the movies and see all the art, learn all the languages, study chemistry, herpetology, oceanography, paleontology, ichthyology, political science. But I can only pick one thing before I die, society? Just one? *sigh*