The Tull sets are actually distributed by Warner Music, not Universal, but I agree. They are amazing, well-priced sets, and many have sold out from many stores, so they do sell well.
I appreciate the correction. Hard to keep it all straight, even after reading the Chrysalis Wikipedia page carefully...
I think the main issue is that Steely Dan aren’t ones to want include any kind of extra material in any kind of reissue, so apart from straight remasters and 5.1 Surround mixes, we probably won’t see anything else released from them, so that really doesn’t fit into Universal’s current box set model.
You're probably right about that. Unless Fagen has a late-life change of heart and decides to okay some of the better bootlegged stuff--demos & outtakes, live radio broadcasts, etc.--or even just "Dallas" and "Sail the Waterway," then the only option for a box set from existing material, assuming the quad masters still exist, would be the three quads plus Pretzel 5.1.