It occurs to me that games from abandoned developments could be included in Retold.
Firstly, Ao3 may or may not appeal to the public, but it’s clear that Microsoft doesn’t want to touch it with a ten-foot pole. However, I think one option could be to include it in Retold in the same way that Ao1 became part of Ao2 with Return of Rome. AoE 1 and 2 are compatible because they were made with the same engine. Ao3 in turn, was also made with the same engine as AoM(well, actually, Retold is a modified version of the Ao3 DE engine, which is itself a modified version of the original Ao3 engine, which is a modified version of the original AoM). Therefore, they should be compatible, at least technically. Logically, they wouldn’t be designed to be played together under normal conditions.
The other suggestion is quite ridiculous, putting Warcraft 3 Refoged inside Retold as well. It’s ridiculous not only because they’re made with different engines, aesthetics, and designs/gameplay, but also because they’re from different companies; but Reforged is dead, and Blizz now belongs to Microsoft, so well, at least they’d be making use of material by putting it in a clearly more successful game (who would have thought that the time would come when AoM would surpass WC3 and that I’d live to see it).