I always find it mildly amusing how people seem to assume that three presidencies down the road, we'll still be tossing around the politicians we have today.
As I said earlier in this thread, why not put yourself in the shoes of somebody in 1967, and try and predict the next three presidents. If you guessed: a Vice President who left office six years previously; the House Minority leader; and some hick state legislator from Georgia; you win a prize!
Of course, a whole bunch of other years could be picked and you'll find the same effect.