They're going to have to do something. My dad's Bible probably won't last another 3 months. If the Bibles don't reappear in stock as mysteriously as they disappeared from stock, they are going to have to say something about the issue at the Annual Meeting.
Otherwise, I would think that WT would be afraid that the sheeple won't contribute enough if everyone were to suddenly have to replace their Bibles.
I dunno what will happen, but it's fun to speculate... Maybe they're working on a deal with OfficeMax to sell an official WT Tablet loaded with the NWT, available at a "discount" to the brothers and sisters.