PG has made similar comments about the use of Lisp. It doesn't really scale to the IBMs and Googles of the world, though.
This is key. If you think you'll want to or have to hire an 800 person staff then you're going to lose developer quality and will be served by picking languages which are already common on the market.
Jane St. Capital also does this to some extent by using OCaml, but I don't think that was the primary motivation.