Development Hell: Robotech is one of the longest film development projects even to be stuck in the 7th circle of development hell. Many screenwriters, directors, and leading actors have been rumored to be connected to the project — but no live action films have been released.
The main problem is the red tape, particularly copyright. Some fans of the anime Robotech was stitched together from object to the project on principle. Being a patchwork also causes problems with internal logic.
Executive Meddling: The plot of the Robotech Movie was once going to be vastly different, but had to be changed drastically once the creators of Macross realized this movie could somehow interfere with their profits from Do You Remember Love. Somehow.
The movie was pulled because it was successful with adults but not with children, the demographic which Cannon considered the film's main audience.
No Export for You: Due to a massive and convoluted legal snarl between Big West, Tatsunoko, and Harmony Gold, very few Macross series will ever make it across the Atlantic.