This is important enough to elevate to an entry.
I had a recent post discussing some analysis Jeremy Berg posted at ASBMB Today ("The impact of the sequester: 1,000 fewer funded investigators") looking at some NIH data on the number of PIs who entered and exited the R-mech funded population across FY11-13.
He came by and left this comment:
I would welcome any suggestions about other longitudinal aspects of the NIH grantee pool that might be high priorities for analysis. Post here, at http://www.asbmb.org/asbmbtoday/201403/PresidentsMessage/ or email me at email@example.com.
So if you can clearly specify some sort of examination of the extramural PI population go to it! He's apparently the guy who can actually make it happen.