Dustin Hoffman as Deckard in Blade Runner. He was initially considered for the part.
Since Dustin was able to be such a HERO as Babe in Marathon man, he eventually had everything to be a convincent Rick Deckard in Blade Runner. Probably the chemistry with Rachel/Sean Young would be better, Dustin is a sooo, unexpected, seductive man... Greets from Mendoza, Gustavo.
I could see this as having worked out, but Harrison definitely has more of a rough edge to his appearance that made him fit the part better. Just my opinion. Also...there's no way they could have ever gotten anybody to do a better job at playing Roy Batty than Rutger Hauer. He makes the best crazy person.
I think it would have been more Philip k dick with him in the part.
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Now thats cool! I never thought he'd work in the part but after seeing this it might have worked!