There is no guarantee that you can sell your ideas, no matter how good or successful they may be, consider the production of a film, hire the best in their field, spend a fortune on promotion, work hard, and nothing will guarantee that it will be a success.
The history of cinema is full of films that lost money after having done everything necessary, that's why the studios stick to anything that worked until they stopped doing it.
What requires a sense of smell in order to change tactics and flexibility to adapt to the new demands of the public, the best ones, make the public demand precisely their product, but even this ends up changing at some point.
Superproductions are very well punctually, but a study that invests in an overproduction and fails, is lost without a B series that supports it.
My two cents.