The webapp market is limited by people's leisure time. There can't be 10 Facebooks, because if the average person spends 30 min per day on Facebook, then it would have to spend 4h30min on the other 9 webapps. Nobody has that much time. The market for electronics, photonics is almost unlimited... because these technologies are meant to automate, not to entertain. This is not a matter of electronics being "nobler" than webapps, it's just the realization that one encounters certain limitations in the webapp area that do not exist elsewhere.