Looking granularly,
1977 = 2009
1979 = now (we are going 1/2 as fast as in the seventies)
Peak occurred Jan 1980 ~ Jan 2015 if double time frame holds
Similar move would result in 4875 in Jan 2015
Half that move would result in 3270 in Jan 2015 (for the glass half empty crowd)
I'm in for either.
Strike
PS Great find WTS!