Unfortunately, there's only so much you can do when you "re-master" an album. i.e.. Maybe the mastering engineer can add a touch of reverb to the height channels, but that's it. You can't "un-bake" the cake that is a mixed album.
What would really be incredible is for mainstream artists to enter the recording studio (or at least the mixing phase) and produce new music with multi-channel production in mind from the start. The only people doing this right now are film composers like Tom Holkenborg, aka Junkie XL. Meaning, he employs surround production while composing and recording.