No i don't think so that bitcoin is worth to be currency because if in anycase it will become currency then no scope for investment will be left. People invests in bitcoin to earn number of profits and make the money double. And this will not be possible if bitcoin will become currency. So according to me bitcoin is not of the worth to become currency.
Even if people used bitcoin as a currency instead of an investment it does not mean that big profits will not be possible, you will just need to change the way you do things that is all, for example if the movements of bitcoin became more stable then you could use leverage to make money with bitcoin and the lesser volatility, but do not worry a stable bitcoin will not happen soon.