They are already releasing albums using AI demixing to make "stereo" recordings from mono. Granted, this is happening more in the pop music realm, to milk whatever value is left in older recordings. If they haven't gotten around to using this technology on older jazz records yet, it is probably because there is little commercial reward in doing so. But this technology is out there, and lots of music is in the public domain in Europe, so it will probably begin happening if it has not already. I am less interested in "stereo" versions of older recordings than I am in the ability to bring down instruments that are overbearingly forward in the original mixes.