The business media lit up over the weekend with the news that Steve Ballmer, the college friend who worked alongside Bill Gates to build Microsoft and was heir to the CEO job, will step down within a year. Ballmer, whose skills were in many ways complementary to Gates’, took the helm of an already massive organization as it entered an era of relentless disruptive innovation by competitors. He managed to hold the stock price on a pretty even keel, but no better than that.