It's interesting you should mention the 1860's. The long view is especially relevant to this thread. The 1860's had a lot in common with the 1960's in that bother were times when the very fabric of the US was being ripped apart. In regards to the civil rights movement, the 1960's was simply the final completion of the work began in the 1860's.
The other movements during the 1960's were the natural culminations of the socialist/communist/unionist movements which also started in the late 1800's.
I'm not naive enough to think that we will never see another period of great social movements, however such things do not happen overnight and typically take a long period to reach their zenith.
Dean's rant has nothing to do with reality or with any identifiable movements that are reaching their tipping points any time soon. The homosexual/civil rights battle being the only big one on the horizon and that one will not see the large social upheaval that the other's did.
ROFLMAO! Forget, hell!