so, this article seems to back my thought.
Why would everybody remix the stuff again in Dolby Atmos? The number of people who have a 5.1 system is limited and only a small percentage of them might have (or want) an Atmos system.
Also, most albums were never intended to be mixed in 5.1, so upgrading music to 5.1 is one thing, but Atmos?
I don't see this coming for music.