Lots of things could happen between now and the Convention...McCain is old.
That is true. I have written that I won't vote for McCain, but fate is a powerful argument. God forbid that terrorists should strike the White House; or an American president die in office due to an accident or illness, or voluntarily step down due to disabling illness...but in the event, do we want McCain's vice-president, or Clinton's?
That said, I don't believe McCain has a prayer of winning the election.
Oh, and Fred? Thanks for your leadership. /s