That was the story in 1982 back when the Gundam theme was popular. The themes for each Macross series change for each series. In M+, the theme was technology's impact on society. In M7, it was a conflict of ideology. In M0, we saw how people judge one another through initial impressions. The theme of each series changes and I expect the same out of the new series. I do not expect Kawamori to revisit any of these themes nor do I want him to.
And all this talk of retcons...at this point, I've learned to just live with it. Eventually, someone is going to come along and say "I didn't like how it was done or explained, so I'm going to do it MY way." I have seen this in movies, TV shows, comics, blah blah blah. I hate it, but I've seen it done so many times, I expect someone to come along and say "F U. I'm going to do it my way. Screw what the last guy did. I like it my way and if I can do it, I will." That is what happened. That is what is going to happen. Even Kawamori will do it to himself. Why is it done? Cuz everybody has their own opinion of how it should be done and if they have the ability to do it, they will do it. When Kawamori passes the reigns to someone else for, that person will go back and say, "I want to do things my way" and make changes cuz he or she damn well can, hence a retcon. Some people will hate it. Some will like it. I really don't care cuz I know, it's going to happen.