The problem is they already thinking franchise before the first movie is even put out, that's why the fail
the first movie has to be successful enough to create a demand for a sequel, but you have to be aware of it failing, so the movie has to be written into a self contained movie, that can stand on itself, they start making these movies as build up to the next film from the get go, and that's why they fail
the amazing spider-man is the exact example of this, they spent so much time trying to build it into franchise that it collapsed onto itself
Batman didn't become a movie franchise because they tried to do it, Tim Burton made one Batman film, that film can stand on it's own, outside of anything, it established the IP, to the point Batman is coming out in 2022, the first movie was in 1989, it doesn't even need direct sequels or ties to anything, all that is needed is the character because it has proven to be a success.
If the first movie Blade movie wasn't good it never would've been a franchise, they fukked up, by taking the franchise out of the hands of the people who made it successful in the first place, and that's how franchises die, but the reality is because of the first movie, Blade WILL ALWAYS BE ABLE TO HAVE MOVIE MADE, it's solidified just because of that first movie, it's still a franchise