If it is to be adopted widely, at some point it has to go from being distributed among a few million, to being distributed among a few billion. The continual price rise will correlate with that adoption continuing to happen.
So yeah, I understand all these arguments about volatility, but the reason they don't bother me is because they don't seem to point out anything bad about bitcoin in principle, in the long-term, they only point out the negative aspects of using it as a currency while its undergoing its adoption phase. I don't think there's actually any argument that using bitcoin as a currency right now isn't going to work as well as dollars/euros.