As just yet another viewpoint, to add to the many good existing comments.
Atmos/Dts:X have a good number of recent films which do show a lot of the potential of the formats and equally a few that, frankly were wasting their time. Ready Player One, Mad Max Fury Road, Kong Skull Island are a ones which do make the most of it, Oceans 8 does not. It is largely down to the mix and sound engineer, but also the type of movie. Kitchen sink, court room, romance type dramas are unlikely to work particularly well. Action, Horror, Fantasy, Sci Fi, Superhero movies are more the type to exploit the new formats.
Regarding DSU/Neural X the mileage can vary here too. My 1930s Marx Brothers collection are never going to sound like they fill the room.
Last night however, I watched 28 Days Later (2002) and 28 Weeks Later (2007) Dvds as part of my Halloween selections.
These up mixed very well. Gun fire around the room, music, helicopters and rain overhead and a number of good dialogue pans. So the same kind of categories as mentioned work here too. Anything since probably the 1990s will likely improve with an up mix.
For music it can be a bit hit or miss up mixing, but as a general consensus Auro 3d possibly works best, with DSU much prefered over Neural X. The DSU centre spread option is required to make the most of music, but should be off for films. Essentially it stops music from pulling everything to the middle.
Will it every be mentioned in the same breadth as vhs->dvd, tape->mp3, 2.0->5.1, dvd->bluray->4k, hell no, and I have no doubt tons of research and $$ has gone into the tech.
Like all the previous mentions Atmos/Dts:X is having an impact on new releases, old re-issues and the availability of capable equipment. It took well over a decade for Dvds to supplant VHS and blu rays have taken equally as long. 4K/HDR needs households to replace the existing standard def or hi def tvs and projector to have a chance at being the default, that doesn't happen overnight. Remember they still sell vinyl and in fact the sales are increasing.
I do watch a fair bit of streaming and OTA tv and while it does work, sometimes very well, I still prefer to own actual discs for both music and films.