People for a long time called bitcoin bubble, called even in 2013, when it cost 35 dollars. After all, this is an unexplored territory. We still do not know how to evaluate this currency and what will happen to it later.
Even today they still call it as a bubble every time when Bitcoin started to decline the market price and drop so big. They just compare it to the tulip mania because of the sudden fluctuation of the price of a single tulip before and then later on it's just gone which brings to most investors to get bankrupt when they bought the tulip for a high price.
On those people who bought bitcoit at the higher price who suffering for loses it is always that is why other trading experts telling that "make sure to buy at the low price then sell it at the higher price" this is always basic thing that other people must do so that they can preven't of losing large amount of investment.
Bitcoin today is rising but it doesn't its bubble because if the price increase more than 20% then suddenly drop we can say that it is bubble.
Well maybe as you think, but in my opinion bitcoin will go in the direction of slow growth and slowly reach the big numbers, not jump like some other currencies.