That's the final number for the WSOP. Today's session received 2,808 players, supposedly a sellout (though the tournament information sheet said that 3,000 was a sellout). In any case, they did manage to exceed 2007, and the dropoff from 2008 was only 5%. Here are the numbers:

Day 1A: 1,287 (2007) vs. 1,297 (2008) vs. 1,116 (2009)
Day 1B: 1,541 (2007) vs. 1,158 (2008) vs. 873 (2009)
Day 1C: 1,743 (2007) vs. 1,928 (2008) vs. 1,697 (2009)
Day 1D: 1,787 (2007) vs. 2,461 (2008) vs. 2,808 (2009)

Total: 2007: 6,358 vs. 2008: 6,844 vs. 2009 6,494.


My estimate of 6,300 wasn't that far off.