Is your screenplay a good fit?
I came across the infographic below recently. I think it's a good way of assessing a screenplay in its early stages, namely: why am I writing this script? Because I want to, or because it addresses the market in a way that may yield a return on investment for film investors, and/or win film career enhancing awards? Think of it as a car. If you built a car you couldn't sell because it can't be driven, you'd be nuts, right?
Don't be nuts.
So please tattoo this on the back of your eyelids: