BTC and other altcoins are now a worldwide reality. Their temporary devaluation will not be able to decree their end.
The way people have started to invest their money into crypto currencies and the way most of the crypto currencies have become the part of so many people is actually a guarantee of this thing that this is just a phase or you can call it as dark days and that they will not last longer. Things will change very much shortly and that the market will rise once again by a significant value, thus helping the people in making more money.
Crypto currency for almost several years had up and down thats I will guarantee that it will go up again. The volatability of Bitcoin sometimes can create an opportunity to invest or to sale, because this is a market place were hungry for oppotunity investors are waiting to make it move once there is a price movement.