I don't think 75% of bitcoiners say it is a bubble or something like that! What did mean you by bitcoiners? Because Bitcoiners never worried about Bitcoin low price, they have enough confidence that everything is ok till now! Who judge Bitcoin's price by seeing the previous year's high pump, they are not bitcoiners!
Yes, you are right. Any one who believes bitcoin is now a bubble leaves the market. Why should such a person spend the money and the time on something which is bubble?
Most of the current holders are the true believers.
I do not believe that 75% of people could call Bitcoin a bubble or a ponzi scheme. I am sure that these rumors affect the cryptocurrency. BTC is the #1 crypto, and it will stay the market leader.