Opening up universes means more CGI comes without another shootings of real scenes, that could just ruin the whole sequels.

I have no clue if you have watched Tron: Legacy, the 2nd half of the movie was all CGI, completely out of blues when I saw it. No content, all CGI. 3D technologies really helped that movie in some way, but let's imagine, if a movie without a compelling storyline, what else does it contain to appeal to the audiences?

Storytelling would be more attractive than just opening up another chapter about battles in Universe, even though transformers used to battle that way in 80s.