i disagree with you. i believe the 7 year graph here shows a very unstable currency that has a reputation for being used in fraudulent activity such as money laundering and other anonymous criminal activity. as can see in this 7year graph there is a crash after every peak of the dollar. that is unstable volatility coupled with years of federal reserve qe printing:
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The dollar shows less than 20% volatility over the course of 7 years on your chart.
Ignoring the fact that Bitcoin didn't exist seven years ago, its volatility was in the order of 10,000% over just the past 5 years.
Bonus point: Calculate the relative stability.
this guy says bitcoins early volatility is normal S curve activity: http://www.youtube.com/watch?v=qHUPPYzzZrI
7 years ago on the chart was the runup to the 2007-2008 financial crisis... which eerily starting to look like todays chart.