Did it ever occur to you that they may be doing exactly that? You can't build infrastructure with BTC; you have to use legal tender. To get legal tender, you have to sell your bitcoin. Maybe that's why the price is going down on the exchanges. Early adopters could be selling in order to raise funds to build infrastructure.
that or they're just trying to cash out completely before total a crash leaving late adopters high and dry.
That's a possibility, but unlikely. Besides, Bitcoin would recover anyway. It would just take a long time. Another chance for us to get in cheap.