1,000 is 300 above where we are at now. If you calculate how long it took us to get from 400 to 700 (the previous growth of 300), which was about 6 months, then at the same rate of growth, it would take us until about the beginning of February 2012 to get to 1,000.
On the other hand, if you look at how long it took us to grow the most recent 100 (roughly one month), then it would only take us another 3 months (at that growth rate) to achieve 1,000, which would then happen around the beginning of November this year.
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If future generations are to remember us with gratitude rather than contempt, we must leave them more than the miracle of technology. We must leave them a glimpse of the world as it was in the beginning, not just after we got through with it. - Lyndon Johnson, on signing the Wilderness Act into law (1964)