These are all solid points. The franchise's built-in longevity, spin-off potential, and merchandising opportunities add to that. With the right talent attached, this is a no-brainer for any studio looking for its next big franchise.
And that’s why I brought up Fast and Furious as a comparison:
1) It’s got a large cast of distinct, memorable and colorful characters with diverse backgrounds
2) Multimedia opportunities like spin-offs, comics, TV shows (animated, live-action, anime), audio dramas, etc., which F&F did dabble in a bit
3) Globetrotting to different locations around the world
4) Ridiculously over-the-top, heightened action
5) Like you said, merchandise (action figures, play-sets, breakfast cereal, etc.)
6) Dabbles in various genres, like action, thriller, heist, mystery, romance, horror, buddy comedy, etc.
Also, now that I’m thinking about it as I’m typing this out, not saying that this is on the same level as that, but it almost could take a similar approach to the model that Star Wars has been using for about the last 10 years (irrespective of their quality), in that it can completely shift focus to other characters, places and times and not have to stay completely linear. The scope of the world is so vast you can just jump around and tell various stories from the perspective of other characters at various points in it’s history.
Like, how wild would it be if you got someone on the level of Tony Gilroy to oversee a conspiracy/espionage thriller streaming series centered around a character (someone we’re more familiar with, less known, completely unknown, etc.) investigating M. Bison and Shadaloo and his illegal methods and experiments to create soldiers to infiltrate the government and take over the world, and Cammy shows up to help the organization down? Or a romantic/action/drama/comedy with Ryu and Chun-Li? A mockumentary in the vein, style and tone of something like “What We Do in the Shadows” centered around Dan and his “journey” to become the world’s “greatest” fighter, directed by Taika Waititi?
Probably a complete pipe dream, but it’s fun to imagine the possibilities.