Sorry, but I just can't see anyone else as Han Solo. Might get away with the rest of the characters being played by someone else, if they were physically similar.
Way back when the original 3 were still new, I read an interview of Lucas where he said he intent was for there to be 3 trilogies from the beginning. He started with episode 4 because there was more action in it than there would have been in the first 3. He didn't know if Star Wars was going to fly or not, it was too different a concept (at the time). But that he was not going to have ANY of the characters carry over from one trilogy to another with the exception of the droids.
He sure did create some inconsistencies from 1 to 4, though. Like why didn't Obi Wan remember R2D2 and C3P0, or better yet, why didn't they remember him??
Anyway, my vote would be no. You don't mess with a classic, and like it or not, that's what the original three are!
Bill
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DML M4A2 Red Army
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-- There is a fine line between "hobby" and "mental illness". (Author unknown)