way to cherry pick your dates, thre were people calling it a scam when I got in at $5, there were people calling it a scam when I encouraged family to get it at around $10. there were people calling it a scam all the way up to the $260 peak and lost more when it dropped from there. People have called it a scam plenty of times and none of them have been right. the value has peaked and troughed and plenty of people have been fortunate to make a lot of money with it and you know what, it is not going away.

Your hypothetical day of a bitcoin worth $0.00 will come when something better replaces bitcoin, not because bitcoin failed against fiat/national currencies, but because it was superseded by a superior product.