I do not think that current investors is in doubt about the price will reach new ATH in the future. Our doubt is when to increase the BTC amount by buying and selling.
Since it's ok to say Bitcoin is an investment and the majority here doesn't see a problem, we can call them investors so. Seeing the numbers of negative topics with the generic "Bitcoin is dead" "Bitcoin lost 1% in 24h I am afraid...". We can say YES they are in doubt. And seeing how many times per week they do it's fair to say it's paranoia too