Even if it would be a bubble, it's still very small to explode right now.
We do have time until all the BTC are found, so we have plenty of time actually))
The good news are, that there are no doubts in technology, that is already integrated in so may sectors. So nothing to afraid off really.
Yes I do believe it is way to small to be predicted like that.
They could always say it is bubble and actually they have since it grew like this and still nothing works.
It is just like FUD that is being spread without any proof that it is really a bubble.
They are just jealous of those who already profits from bitcoin by just holding it.