Honestly,
I am not really surprised that people were doubting bitcoin in the beginning and even now, majority think it is a big scam. All that is happening because of the human nature - people follow trends, but they don't like to risk. People hate to spend their time on learning something new or making a deep research. It is always easier to wait till everyone around confirms that it is safe.
I really regret I did not make research about bitcoin in the beginning and had the same human doubts.