Like all uniform changes, there was a bored Colonel in the pentagon, who needed something to do.
They will give all kinds of reasons, that enlisted now do not need a separate dress uniform
Going back to army blue from the past
But what they did, was take the dress blues, and lower the quality of the material
IE: from a very good suit to a cheap suit
And make it the class A's
2. There was no demand for it, no one had any issue with the green class A's
3. my personal opinion, is if they wanna go back to blue uniforms, then go back to the Civil war era dress uniforms, they looked much better and go back to the old Calvary stripes for enlisted
Which are still issued today, for those in the Army Band.