I have heard this argument so many times before that even the famous Bill Gates and Warren Buffett saying that it was a bubble but for me that until the day will come that it will burst or the value become $0 then that will be the time i would say Bitcoin is truly a bubble that burst but for now it is very impossible to happen. So better let them wait and see.
The world "Bubble" repeated millions times over the recent years some believe , some deny . so waiting here is nothing . actually what happening now is handing over from old investors to new ones .
lets them talk and do your work .