So long as Bitcoins are used for something, they cannot be destroyed. The fact that there is a 21 million limit on Bitcoins makes it inconceivable that they could be destroyed. Sure they might drop in value but I do not suspect by much. There is continual demand for Bitcoin as it has become a widely used international means of exchange, and it's growing every day. I used to trade penny stocks and they would run up high with nothing going for them, and with over 200 million shares issued, that would still be considered a very low amount. Google's stock trades at nearly $799.87 (last price) and they have 267.71 MILLION shares floating out there, with 329.66 million "outstanding." Do the math. Bitcoin could go VERY high. This could just be the beginning.
This.