IF one uses a linear TRENDLINE:
When will the inherent worth of one BTC = 1000 USD?
Begin here;
April 2011 ca $2, April 2013 ca $139.
So (roughly) $68.50 per year inherent increase.
1000 - 139 = 861
861/68.5 = 12.569 years.
It's a "long" few years according to steady linear growth of the INHERENT bitcoin worth being 1000 USD. Again spikes could see the ATH above 1000 several years and multiple times before the inherent worth catches up.
For example the inherent worth of BTC being 266 USD will occur in;
266 - 139 = 127
127/68.5 = 1.854 years.
Also in about a year and 10 months or February 2015 - but we have already spiked that value once in 2013.
"You've got to know when to hold them."
Don't be a gambler, be smart, buy bitcoins.
N.B. If the US Federal reserve note crashes, 1 BTC will be 1000 USD much faster than 12.6 years.