How much does it cost to do a series of 12 issues against how much does it cost to make a major motion picture? Disney and Warner shouldn't even worry about the failing sales of comic books--I'd bet they pay just as much for a movie treatment. DC and Marvel should be doing more runs of comics to work out the characters and the concepts and then using that as the foundation for a movie.
I'm totally in love with DOOM PATROL on streaming. It might not be a huge hit, but it shows how you can adapt the comics to the screen. I want more of that.