I don't know what the problem is with this format. It's not like the discs won't work in normal equipment. Given the print-through issue with Atmos (locked 7.1.4 soundtracks from Disney and probably soon 20th Century Fox as well since Disney bought them) that won't play properly on higher speaker count home theaters, I'd PREFER DTS:X since at least DTS:X Pro can near perfectly expand 7.1.4 out to 30.2 speakers (with some Auro-3D layout options to choose from to boot) using "center" extraction (I use the same effect in my home theater to get Top Middle that works with everything including Auro-3D and it works GREAT. You can't tell it from the real thing , IMO with actual material playing and Neural X does a better job than old Pro Logic at extraction). Dolby has allowed Disney to put out these abominations of Atmos and their DSU upmixer uses even less speakers than original DTS:X, let alone DTS:X Pro. So I say go DTS:X at this point. It doesn't matter that it does nothing "new" in IMAX Enhanced. It gets away from that locked channel issue.
As for discs (if they ever show up; apparently Angry Birds 2 will be the first release from Sony), if that means I get a Blade Runner 2049 in FULL CINEMA IMAX like it was in theaters, well fantastic as far as I'm concerned (I just wish they'd do 3D as well). How many movies got released without the IMAX scenes included? If this corrects that issue, more power to them. The discs don't need any special decoding to work. No one is making anyone buy them either.