What were the chances of an actual Kennedy dynasty?

History tells us that Robert F. Kennedy was being groomed to become president after his brother John F. Kennedy. Others have also speculated that had this come to pass that it would even set up a future presidency for Teddy.

So what are the odds and the circumstances that would lead to all three brothers becoming POTUS?
 
I don't think Ted ever wanted to be president, much less actually get elected. Had RFK never been assassinated, though, I think it's very likely that we would've seen him in the White House at some point; if not in '68, then sometime soon after. One of the greatest American tragedies of the past 50 years, IMO, is that his life was cut short before he could really make his mark on the country.
 
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