I wonder if Sirius would find itself with a bunch of customers adding and removing the best of XM as the seasons start and stop for people's favorite sports. I agree they need to get the MLB in the line up, but they should also look at porting some of the music and specialty content that XM has to offer to keep the subscription.I'm still a dual subscriber but I like SIRIUS better. I would prefer to add Best of XM (with MLB) to my SIRIUS sub so that I could drop my XM sub.
Of course in the end I was hoping for mirroring taking all the best that each offers and making a combined service instead of one of haves and have nots. There would be the loss of the dual subscribers, but the backend overhead saved by have a unified broadcast and channel lineup on both services should compensate for it.