Seems a pretty trivial change, like, hot water's on the left tap not the right tap.

Humans are more than capable of handling that minor conceptual change. Life routinely throws far more challenging changes to adopt to.

Nothing fundamentally changes because of Franklin's incorrect guess. The postit sticker goes "there " instead of "here" kind of a thing.

Certainly not as grandiose and melodramatic as putting humanity back by a decade.