It depends on your definition of success. If it means IT buying the iPhone, you're right. It will be a while. But if it means employees buying their iPhone, and connecting it to company mail servers, the past two years show enterprise success happening at a fast pace. One also can't discount the VIP rule. The VIP rule is that the company will buy VIPs whatever device they want. Some years it was a Nokia, now it's iPads + iPhones.