FOR more than a decade educators have been expecting the Internet to transform that bastion of tradition and authority, the university. Digital utopians have envisioned a world of virtual campuses and “distributed” learning. They imagine a business model in which online courses are consumer-rated like products on Amazon, tuition is set by auction services like eBay, and students are judged not by grades but by skills they have mastered, like levels of a videogame. Presumably, for the Friday kegger you go to the Genius Bar.