I stumbled onto this today while showing Briana James and Mike Goldie how relevant (or otherwise) spinning 200+rpm is :

http://software.bareknucklebrigade.com/rabbit.applet.html

It's a calculator for speed vs gear inches.  The bottom line is that the fastest track sprinters, if they're pushing 100" in a flying 200, are doing ~160rpm. If they're pushing bigger than that, it's lower cadence. It depends on the rider, but the fastest flying 200's are around 72-73km/h, which is, on 100", around 155rpm.  I think they ride bigger gears than that (106"?) so that cadence is even lower. It's still a very high cadence, but it's not 200rpm, and top track sprinters would be unlikely to ever break 160rpm in a race situation on a race gear.