I don't see why Dish wouldn't want to. If it's a competitor why not offer their service so customers can have both but using the device you make. This should help keep customers sticky.
What I would like to see is the MLB.TV App on the Hopper. That way we don't need the Extra Innings thingy...but we could still access the games via our existing accounts with MLB. That would also take less bandwidth than using EI. (I think)