Dr. Who began 40 years ago, JFK was killed 40 years ago. Coincidence?
Interestingly enough, the very first episode of Dr. Who, "An Unearthly Child", was delayed because of the JFK assassination. The BBC also re-ran it again the following weekend.
For real tin-foil action, notice that the very first Dr. Who DVDS ("The 5 Doctors", "The Robots of Death", and "Spearhead From Space") were released on September 11, 2001. When I went to sleep on September 10, thats what I was thinking about :(