I still think the best way to discuss this is with what Andy said:
What if Mcconnell retires?
McConnell won't retire. He has very little to look forward to in life. Nobody likes him; he has the lowest approval rating out of all 100 senators. The Senate is his mistress
Thirty-six years as a senator, including over one dozen years as the GOP leader? How can we assume he'll stay healthy for another 3 years? Just because he looks like a tortoise is no reason to assume that he'll live as long as one. I predict he will retire.