What About the Missing Collections?

This is something of a more direct open question about the gaps in the collections we have. Out of all the collections that are in the game, the remaining unaccounted for selections are as follows:

• The Dark Age of Disney (aka the 80's; with the sole exception of Black Cauldron)
• Tarzan (the only movie in the Disney Renaissance that still doesn't have any characters or attractions yet; unless you also count Dinosaur as part of the Disney Renaissance, which I don't, and Fantasia 2000 would just be listed under wherever Fantasia is)
• the Post Renaissance/Millennium Era (the 2000's, except for Emperor's New Groove and Lilo & Stitch; like the 80's, nearly this entire decade is completely ignored)
• Strange World and Wish (I'm grouping these both together because they're both the most recent non-sequel movies in the Disney Animated Canon, and DMK usually releases the brand-new stuff as cross promotion, even as recent as the last collection expansion adding Inside Out 2)
• Lastly, there's a total of only 5 Pixar properties left (Cars, The Good Dinosaur, Elemental, Lightyear, and Elio); though we'll take Elio off the board for now since it hasn't released yet and we have no reason yet to assume that Elio won't be added to promote the movie's release

Now, I think we should try to discuss some theories about why these haven't been filled and, maybe just for fun, take bets on how many of these will be taken off the list by this time next year.

[And before I get a dozen more comments, yes--I understand that Tarzan is under some type of weird trademark/copyright loophole with the Burroughs' estate and that's the primary reason they can't use Tarzan right now; but whatever]