I don't think its in a bubble but it is traded in a very volatile marketplace with the only reason for major price drops have been the China ban and hacks, as long as adoption grows so will the price - that is the most basic economics there is! Once accessibility issues for the non-tech savvy public are resolved and they also realise you don't need to buy a whole coin growth will accelerate.
In regards to economists coming out against it the very reason is goes against almost everything before it, you have a nation-less currency that is ungoverned and isn't in a physical state. The tulip bulb reference is crap, the same can be said about gold.... it had no value until some else wanted it.

While i think that there is amazing potential for growth there will also be some set backs as governments around the world protect their own interests, by getting in now you will still be one of the early adopters and buying at a discount.