I think the bigger problem, as has already been said, is that Macross manga misses out on one huge part of Macross: music. Losing such an important aspect of a series in manga form, really counts against any substancial Macross manga being made.
They could release a soundtrack with the series or something...
anyway, I don't think they're interested in that at all. I mean who has time to think about manga when you're thinking about all the dogfights aerial CGs that happens on screen. I'm sure Kawamori would find it boring to think up an exciting story and only have a fraction of it translate on paper. Recently the storytelling has been the weakest point of the animes, that's pretty much all you're going to get in the mangas.