I ultimately could be wrong about this, but the way I see it - Robotech ISN'T getting made into a movie. Sony is going to sit on it like Warner Brothers before them. In fact, Sony recently announced their movie slate until 2019, and it wasn't on the list. The recent James Wan interview sort confirms it too, since he clearly doesn't know. Instead, Sony is focusing on tried and true properties like:
The Magnificent Seven
The Dark Tower
Bad Boys 3 & 4
Not having access to the original Macross names and designs should be a big blow to the project as it is, but I think the bigger problem is they can't sell the movie to Japan - noted for being one of the biggest box office markets in recent years.