I have to admit, I am hoping Comcast is not making the decision alone. Or, if it is, I hope TiVo ends up having some strong input before Comcast makes the decision.
Since the files and the apps exist in the DirecTiVos (if you hack it, you will find it), I have to imagine that TiVo itself wants a solution that extends all of their service to all of their users. There were rumors that TiVo was willing to support DirecTV customers with HMO on their systems, but that DirecTV turned them down. I was, and still am, hoping that Comcast and TiVo reached an agreement for TiVo to take some sort of active role in user feedback and support.
So, yes, I do get concerned when I hear that the Comcast TiVo will basically just be slapped-on to replace I-Guide because I think that will do TiVo, Comcast, and their customers more harm than good. On the other hand, if Comcast and TiVo are actually working hand-in-hand to create a comprehensive TiVo service, then it's going to be a worthwhile venture for all of us.
I guess only time will tell, huh?