There are so many elements, so many perspectives to films that this over simplification of the process of a successful film is kind of scary.
I suppose it all depends on what you call a successful film. If your goal is to make a film in 20 years for $250k and turn at least a $1 profit, assuming films haven't been outdated by then, it's entirely possible.
If you're aiming for a blockbuster hit, there are a bunch of important elements you'll need to consider.
Mind you, I'm not saying you cannot do it.
I suppose it all depends on what you call a successful film. If your goal is to make a film in 20 years for $250k and turn at least a $1 profit, assuming films haven't been outdated by then, it's entirely possible.
If you're aiming for a blockbuster hit, there are a bunch of important elements you'll need to consider.
Mind you, I'm not saying you cannot do it.