If George had gotten some hack instead of Alec, that might have happened.
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Of course, another theory is that Sir Alec Guinness saw the potential for a sequel, and really didn't want to continue playing a major role in the franchise. It's no surprise that the legendary actor had problems with the role most folks would remember him from, so between better serving the story and keeping his actor happy, Lucas might have made a quick change, and inadvertently created history.
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Diogenes of Sinope:
"It is not that I am mad, it is only that my head is different from yours."
"Other dogs bite only their enemies, whereas I bite also my friends in order to save them."
Arnold Judas Rimmer, BSC, SSC:
"Better dead than smeg."