Everything you said is true....theres other reasons though. The anticipation itself is gone. People moved on as other projects came out. There is arguably more hype for Tana Talk 4, Pusha T is probably gonna drop real soon, Games album with Hit-Boy, there is also the Donda 2 hype.....sure they are different artists with different sounds, but GDMM is being squeezed with all the good releases that just dropped and all of those around the corner that people may be anticipating more.
Between the time he released From King To A God and now, he had a number of windows he could have dropped the album and it may have done well. Granted a lot of it falls on Shady, but if it doesn't do well/isnt well received he's gotta own his role in the terrible rollout as well.