The NBA has tons of PAC-12 players from past years...sometimes 4-5 players made the first round.
I think the talent pool is in a cyclical down period....anyone can win or lose...The PAC-10 lost 8 players in the first round in 2008 (4 in the second); in 2009 (5 first and 3 second), in 2010 (only 1 first and 1 second) and in 2010 (3 first and 2 second).