They Won't - Someone Else Will
Screenwriter walks into Producer's Office, pitches him a new idea, producer's answer "Not for me". Writer's response "You probably rejected Gone With the Wind." His answer, "Yeah that was me". A scene from Billy Wilder's masterpiece Sunset Blvd. His vision of Hollywood then and now hasn't changed. The same holds true for the International Film Community.
Of course in Lala land you deal with the studios and streamers, while outside that frame, films in the EU are produced by committees.
Pitch and more pitching with the hope someone has your vision of the film you wish to produce. Back To The Future - 40 rejections, Raiders of the Lost Ark even though Spielberg was attached, Psycho, Pulp Fiction, The Usual Suspect, just to name a very few that after a long struggle and rejection slips finally radiated on the screen.
...And even among the classics, in 1982 Chuck Ross, a freelance writer mailed Casablanca under its original title around Hollywood, all rejected it.
There are so many pro & con rejections from a producer: Our plate is full, we don't produce that type of film (of course they had in the past), is all financing in place (of course not that's the reason we wish you to co-produce with us), etc.
Once there was a phrase uttered during a past Berlin Film Festival Award by a producer she stated, "We thank those who believed in us, and those who didn't believe in us."
All of us in the international film community face the daily joy of creating a film with its pros and cons and personal care.