It’s all wishful thinking at this point, honestly. Rumors abound on what’s in Disney’s archives and what they have at their disposal, but nobody ever really knows for certain until we see empirical evidence. If Taylor’s audio tracks did somehow survive 70 years of questionable storage conditions by the time the Blu-ray was released, I can’t imagine that they would be in great shape, but I’m open to miracles too, so hey, let’s see what’s on the next Fantasia release.
Until then, you may want to see this. I discovered a while back that, according to the studio drafts for the infamous 80 minute version, Deems Taylor was not only kept in the picture, but some of the commentary missing from subsequent “general release” versions are in this cut of the film. A 35mm print of this would be nitrate stock, not safety, so odds are that version is long gone unless Disney stored it properly for decades instead of junking it. Years ago, however, somebody on eBay sold what they claimed was an 8mm version of that very 80 minute cut, but other copies have never shown up since. I wish I had the listing page to prove it. Better still, that same 8mm print to prove what version of Fantasia was on it.