That would be amazing to see. I think though, that they may have to change a few things up. First, since it seems that Despondos was pretty much a barren plane of near darkness, with very little else in it (almost limbo-like), I think they would have had to have Etheria be somewhere else. Perhaps, Hordak and crew, with a brainwashed Adora in tow, could have created a gateway that led them to Etheria, which lies in another part of same universe as Eternia. Hordak and crew then would take over Etheria. Since Adora is now on the same dimensional plane as Eternia, the Sorceress could tell He-Man where she is, and the rest could play out in a similar way to the Filmation, albeit more modernized, and a little less kiddish.