First of all, loglines make statements.? They don't explicitly raise questions. So a logline should never end in a question mark.
Even more relevant than the movie Fitzcarraldo, was the real life struggle of the director Werner Herzog to make the movie in the jungle of Brazil, as documented in "The Burden of Dreams".
If this story idea is based on the real life struggle of a real life filmmaker to ascend K2 in the 1950's to finish a film, then it would make for a credible and compelling story.? Otherwise, imho, not so much.
fwiw