No ,it isn't true .why don't you research about it and try to read.some of their replies before acting like that. That's really possible but if you what bitcoins right now ,do you think it would die after all ? There's so many good news about bitcoins and its adoption so maybe the future after bitcoins reach its end may die but it will not happen as of now.
Yes because one user saying it should not make you think and question about bitcoins.Some one having loosen some amount in bitcoin by spending in ponzi sites or loosing some decent amount in the trading of bitcoins say something like that,and thats because their own fault,bitcoin is growing and has a lot more potential.