Since bitcoin is aspiring to be a new currency that is frequently used by people, it will automatically become something that will fund new investments. If people want BTC, they will accept it for doing something, building something, or starting something. If it took off, it could be used for anything that paper/metal money is used for now.
That's not really what I mean. People use dollars and euros now, but there's no money, banks aren't lending, businesses aren't making enough to fund expansion, stockmarket is (i am told) on the slide, governments have all gone austerity-crazy because bankers ubber alles etc. Could a bitcoin boom change that and spur economic activity grass-roots up.