The problem is that the IP stream will likely be behind the satellite stream (the closer to "live" it is the more impact a brief network hiccup has on the stream) so that might not work too well. Its possible, but they would probably tell people who are interested in that "hey you can avoid rain fade entirely with the IP product" - then those customers will want to put up a dish as backup for when their internet goes out!
As for giving the IP product "for free" to satellite customers, dream on! People would just find ways to abuse it to have Directv in two locations.