Barry Goldwater believed that there should be no public tribute to a man until he had been dead for 50 years and could be judged dispassionately by history. That meant to Barry: No statues, no dollar bills, no coins. Had we observed that 50 year waiting period, it's possible but unlikely that FDR would have gotten on a coin in 1995. And I can absolutely guarantee you that Jack Kennedy would not get anything when his turn finally came in 2013.
50 years??? Looks like more less than one. Same for FDR. He got his dime in 1946
FDR got his dime in 1945, not 1946. That year saw the minting of both the Winged Liberty ("Mercury") dime and the FDR dime.
Kennedy died too late in '63 to get a coin for that year. He got it in '64.
My point is that neither of these men would have been so honored had we followed Goldwater's advice and waited 50 years to evaluate them and their legacies.