I'm guessing the ship of WHV doing Scooby sets is probably more sunk again since the window of time since the release of Mask of the Blue Falcon didn't result in them making a move.
So our better hope is that WHV will let WA eventually do them, while they continue to do random episode sets to sell in stores. As we've said enough times till we are blue in the face if WHV can do random sets of other products they sent to WA, would it really hurt anybody to just make MOD of the episodes that they already sell together in digitial downloads for the people that are willing to buy them?
I'm guessing the problem is WHV still sees some market value in those sets whenever they are made could sell in stores because it's Scooby Doo. Of course the fact that they are probably making excellent returns on random episode sets for kids doesn't help in favor of us seeing them do season sets any time soon.
I'm not sure why of all the shows left in WHV's grasp Tom and Jerry Kids was the one for them to return to for HB season sets. But it brings us back to our eventual logic that in a decade or so when WA is releasing the really bottom of the barrell HB shows if we still don't have season sets for those Scooby, Smurf and T&J shows, WHV should clearly see they would sell well enough.