>My first three candidates would be Journey to the Moon, Wings, and Citizen Kane. What do you think?

IMO the movies you listed (especially Wings and Citizen Kane) do not need remakes, let alone shot-by-shot ones. As an example, the original Wings has amazing non-CGI practical effects (including using actual US soldiers as extras) and I doubt a modern remake could top that.

Similarly, with Citizen Kane, you literally have Orson Welles himself as the director and star. One of the all time greats of acting and one of those things you literally cannot equal/top. Ever.