Actually about 10,000 pilots will retire based on age 65, from 2011 to 2033. The numbers start around 200 a year, then work up to 800+ (2021 thru 2024) a year in 2021, then decrease back down to 200+ a year in 2033. S0, the averages start at 200, peak at 800+, then slowly back to 200. During this time period, there will be 15 consecutive years of 400+ (400 to 700; 2017 thru 2031) retirements per year.
Basically, the word is to start hiring in 2012 and we don't know when it'll stop. I'm guessing the company is going to want to achieve a narrow body vs wide body pay rate in our 2012 contract, or some incentive to cut massive training cost over 20+ years.
And not to mention the added LGA flying and long haul international mentioned in the above post.