If bitcoin was dead then so would this forum be and those people wouldn't even be posting here. I think most people who claim such things are just trolls. Some are probably pissed that they missed the boat or bought in at the peak and now they can't do anything but pass the time by trolling (that's if they didn't sell their coins already and are now at a loss which would explain the hostility). Trolls just need to find better things to do because if people on here thought bitcoin was dead then they wouldn't even be here in the first place.