Imprecise transcript:

  Q: Are you convinced that you're more successful
     because of OCaml?
  A: <jokingly> I certainly have job security! But
     seriously, I think the answer is yes, for many
     reasons that are difficult to tease apart. One
     of the big reasons is that it became easier to
     hire great programmers. We hired many great
     programmers before we switched to OCaml (and
     they have since adopted OCaml) but it took more
     effort to find them than it took to find great
     functional programmers. It's hard to describe
     how significant the effect was, but I believe
     it was important; our language choice impacted
     our tools and results in a positive way.