So you are talking about risk. The risk in investing in bitcoin or anything is that you can lose all your money. That is the highest kind of risk in anything. It is your money and it is a huge amount. You have to make the decision yourself. What is your personality? Do you like to take risks? Do you think bitcoins will occupy a beneficial position in your depot? If so, go for it.
Risk is everywhere in life and investment in bitcoins is also not risk free. So there is no thing in the life which has no risk. But i still think investment is bitcoins has very less risk as it is the most demanding currency of this decade.
It is true that we have increasing demand on the bitcoin, when the supply stays the same (on the contrary to the regular currency) but it doesnt necessarily means that it has very small risk because of that.
I would even say that bitcoin is in the group of the risky assets, because its price is highly volatile, and the fluctuations are on the chart everyday, with a unexpected moves.
Only lately,
BTC has become kind of stable, but I think that is because everybody is waiting for some incident that will be a key to further rise, or drop.
I assume it will be rather a price decrease, because we have been for so long on the 1200-1250$ area.