People want it for all the abandoned concepts from TLK. That film was meant to kick off a whole cinematic universe that, while ambitious, was delusional. If they had any self-awareness about how bad their script was, or how little the public trusted them at that point, they'd have known that TLK would be their last and put all those abandoned concepts in for one big finale. I think Michael Bay's reluctant continuation of this franchise basically hardcoded the potential to turn each film since DotM into a finale. If slightly rewritten, DotM, AOE, and TLK could easily have been finales. They could've cut the multimillions of water, dirt, grass, and buildings exploding from the third act of TLK and spent the budget on those abandoned concepts instead. Who cares if the WWII, Headmasters, Beast Wars, or giant snake concepts weren't earned? You really think anyone would've pointed fingers at what didn't make sense in a Transformers film at that point? I would've paid to see robot gorilla out of context any day, or an Optimus/Megatron retcon for a gladiator origin story. Those concepts would've been awesome. There was no point saving it for later because they should've known their time was over. Now, it kinda leaves me wanting Transformers 6 just for those ideas, even if storywise they're bad. Maybe they should make a low-budget, animated, direct-to-video sequel to wrap it up.