If you have a good idea, get it out there. For every idea I’ve realized, I have ten I sat on for a decade till someone else did it first. Write it. Shoot it. Publish it. Crochet it, sauté it, whatever. MAKE.
In honesty, there are probably a lot of stories that can be told with Batman. I like the idea of him growing older and he can't quite do it as much anymore.