For me Bitcoin is surely not a bubble as we have already seen much drops in the prices of Bitcoin and other crypto currencies and also their are many examples of very rapid rise in the rates of some coin so we cannot say that it is a bubble as a smart investors will now buy more coins as it is a great opportunity for every one to become rich very easily.
I agree with what your opinion here. It is almost impossible for a bubble to survive more than 8 years. All those negative news you hear about bitcoins sounds so funny and stupid. Earlier people were saying that bitcoins is being used by criminals and thus it will not rise much as governments will ban it. And recently I read an article saying that now monero is being used for criminal activities instead of bitcoins and thus bitcoin will not rise and its demand is decreased because of this. I think bitcoins will break all records this year.