June 22 (Bloomberg) -- Bloomberg View columnist Megan McArdle presents a commentary arguing that we are three years in and we still don’t know what this program is going to look like or what it is going to cost. The number of people covered could go up; it could go down; it could flatten out about where it is right now. And the same is true of premiums. This commentary aired on Bloomberg Radio.\u0010\u0010(Megan McArdle is a Bloomberg View columnist. The opinions expressed are her own.)