i have a theory behind the declining interest in the Star Wars toys.
when Lucas was running things the Star Wars Universe was populated with a wide variety of weird and unique alien designs, you could fill an entire year's worth of toyline with just the Mos Eisley Cantina scene from a New Hope. the Last Jedi though? is like 90% boring ass humans in boring ass jumpsuits and Nazi uniforms. what kid wants to buy that?