The easiest, but maybe the shortest. Movie toys cannot be sold for more than a year. While others can last for decades (think legos or kapla)
I wonder if there was something fundamentally different about that property or if there were just fewer options?
If people are still buying tons of Star Wars stuff, and mostly just Original Trilogy stuff, that’s a very different situation.
A blockbuster movie was like a 3-4 year marketing event.