To further your "decision maker" argument. I'm responsible for a budget where we regularly buy a large number of mac computers every year. Everywhere possible, we have held off on mac purchases. In some areas, we are actively planning to move to PCs. While I am a life long (30 years) Mac user, I find myself frequently advocating against the Mac precisely because of what Chuq articulates. Apple is an enormously successful company, and they have found success in walking in IBM-like footsteps. They make products that appeal to the mass rather than to the edge, and they decide on aggregate data rather than vision. It's going to continue to work really great for Apple for a long while to come.
No one in the market has figured this out yet. There is a zygote of users out there that are hungry for better solutions but who have nowhere to turn to. No one out there is really 'disrupting' Apple. But it is a solvable problem, and someone will make it so. When someone does, I'll be moving my circles in their direction.