This chart really has little analytical value other than extreme eye candy. It basically takes a 10 year bull market scenario for gold and overlays it over the housing and NASDAQ bull (bubble) markets - of course putting 3 random series together like this is extreme data mining but hey... it's fun!

What it does show is what any stock investor knows - any asset that is in bubble usually goes parabolic in its last stages. That is generally when short sellers get demolished even if conceptually they are correct... and ironically by the time a true collapse happens they are out of money (or heart) to pursue their intellectual rigor.
While it is interesting to note homebuilder stocks and the NASDAQ followed a very similar path (which gold thus far seems to also be on during it's 8.5 year run), I would doubt there is much statistical value from this. But on the off chance gold is about to go parabolic and follow the paths of the other two asset classes, this would forecast to a price of 2.5 current levels, in the next 18 months.
Translation? Gold $3000 by Thanksgiving 2011. ;) You can imagine what world events would be required for that to happen...
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And can you imagine the smile on John Paulson's face... who is now has holdings of gold instruments larger than most countries? [Oct 13, 2009: Largest Gold Reserves by Country]
[Nov 19, 2009: John Paulson Set to Launch Gold Hedge Fund]
[May 16, 2009: John Paulson Continues to Pile Into Gold]
[Mar 17, 2009: John Paulson Joins David Einhorn as Gold Bug with Stake in AngloGold Ashanti (AU)]
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Eye candy courtesy of WSJ ROI blog