Not sure if you're serious or not, but if the dollar was defined as a certain weight of gold, then the price would never change in terms of dollars.
True, but the price of everything else in terms of dollars would be seeing the same wild fluctuations that you are seeing in the price of gold relative to everything else.
So during a gold run up like 2002 to 2011, businesses would rather just hold the dollar than invest. (Deflationary depression). And now with the speculative bubble in gold popping, you'd be seeing massive inflation. Also making things difficult for business.