One of Larry Fast's LP's explored a similar app in the late 80's, then run by some huge computer. The results were interesting, but not any kind of accompaniment that you would expect from even the most elementary knowledgeable player.
I watched some 19 year olds playing jazz standards at a silly outlet shopping center and what struck me was that although they were blowing clams all over the place, they were taking chances that a machine or a program has no conceptual ability to execute. I loved the energy, and that was what was important for the musician-audience connection, because most people dug it, and they kept walking further and further out on the plank in reaction.
OK, Big Blue won the chess match, but it takes a human to riff an abstraction of "mommas little baby loves shortnin' bread" in a solo during "Salt Peanuts".
Mike