Absolutely. Classical/orchestral RealTracks would be the holy grail of accompaniment, as far as I'm concerned. I wonder if the problem is the fact that string sections would be limited to shorter, percussive techniques, since long sustaining notes would be cut off at each new bar/chord change. Seems like they could do some sort of crossfade thing, or just do as many chord progressions as possible so the program could choose bigger, multi-chord chunks instead of one chunk for every bar. Or at least do common chord progressions... Just brainstormin'.