Forgive me if this already has been suggested, but I just can't keep up with a thread of this size...
Is it possible that CO created the Million-Miler program in anticipation of these (and, perhaps future) cuts to OnePass benefits? MM status is, by definition, much harder to achieve than Plat status. The logic may be that a disgruntled FF might stay on just to keep inching closer to MM status. Of course, 1MM status is devalued by these latest OP changes, but it's not a worthless program.