People often criticize what they do not understand. Is bitcoin a bubble? I would say no, because there is an actual product that is deemed valuable, albeit, by the minority. No amount of calling it names, regulation etc will stop the upward trend, at least for now.
And the earlier they started seeing it as the technology that would change the future, the better for them rather than calling it whatever they like. I feel most of them are just trying to take their chances, and I am pretty sure as much as they are calling it bubble, they are buying in, but their normal senses would not want it to work knowing it is against how they have always done things.
Bitcoin has value and that is a value that can surpass even their own imagination, over time, they will get to accept that fact and obviously nothing will stop it from growing and in few years time, we will quote them and ask if they are still ignorant or they still want to keep calling it bubble when bitcoin has become a normal part of our lives and the way we spend.