Just let them say that bitcoin is dead because people who benefited from using bitcoins will not listen to them. Bitcoins has a good future and it can live as long as people will support this.
When they say the bitcoin is dead, the price could drop, I will buy more bitcoin with the same amount of money.
the price definitely wont drop, there will always be hater on bitcoin i think and we cannot change anything about it, i guess it is better to ignore the people who say that bitcoin is dead