as for reissues of remixed into surround back catalogues or even particular albums, there are still plenty ones, which will spark lots of interest for re-purchasing.Trouble is I don't think there's any back catalogue left, Steven W has done it all ;-)
need to be only willingness of those, who holds the print rights and well organized promo campaign. i think labels or artists can even do sort of voting, which
albums would be preferable for remixing/reissue.
actually, comparing let say 10 years back to a present, i see quite big rise of interest to surround and HiRes formats.