Matt Flynn has an interesting post about what he calls SaaS-ish identity management. The idea is to outsource your IdM managment, the dicussion is primarily about the objections to this idea within an organization. I can see how this can be useful, especially to smaller organizations who can not afford project teams, expensive IdM management packages, and the ongoing expense of maintaining these systems. This is certainly down-the-road, but worth taking note - this could certainly become reality.
There are certainly segments of the IdM market ready to see commodization, and this could be one more way of doing just that.