Analysis by Silver Analyst on 6-8 year cycle of USD since 1970’s.
Note the table in article shows every time USD was up 44% or so in 6-8 year cycle it changed to bear trend.

His position is same as Spock.
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The Dollar Bull Overstays Its Welcome
Looking at the 45 year chart for the USDX, it is clear the dollar has been on a downward trajectory interspersed with some rallies since 1985. As of 2008, the dollar has been in an 8 year rally. It is no coincidence that gold and silver have struggled during this time and precious metal investors will be wondering when the dollar will resume its 31 year bear?

USD Silver Analyst