Greg didn't reply but I think the answer is a resounding yes. I wrote this up a bit back when the devs were using BitKeeper. Lemme go find that. OK, ignore the "I want the 1995 era web pages" look and peek at this:

http://www.mcvoy.com/lm/bitmover/lm/talks/socal/

tl;dr: fan in/fan out scales great if you have BitKeeper or Git.