"It's a Wonderful Life" was a complete failure when it first opened; the post WWII movie-going public stayed away from it in droves. Frank Capra was shattered, both professionally (it was the end of his Liberty Films) and personally (with a crisis of confidence and a weakening of will/direction). Doubting himself for the first time in his career, he started to make the kind of compromises that he'd never made before: filming scripts he wasn't completely happy with, having others choose the cast, taking notes/suggestions for edits from the studio heads. His next three (and not coincidentally, final three) films were utterly forgettable, and soon afterwards he retired and left Hollywood forever, though still only in his mid-50s. Years later, looking back, he wrote something like: "When you make movies the way you think best and stick to your guns no matter what, angels come down and sit on your shoulder and help you make something great. But after "It's a Wonderful Life" I didn't fight anymore for what I believed in, and didn't make my films the way I wanted to -- and so the angels left me, and they've never come back".
Needless to say, "It's a Wonderful Life" is now recognized as the very good/excellent movie that it is, and that it was, and that it has always been. Sure, "the public" will have their say very soon after a golf course opens; all the more reason, it seems to me, for the architect involved to fight for it and believe in it even when no one else does, or at the very least not to publicly disavow it so quickly.
Peter