The word "plummet" means for something to fall, decline, drop but the context you tried to make is for the market to pump, that word isn't right here. However, what you say here is truth about people reaction to the market. You will see people begin to have fear of missing out on the market as soon as they see Bitcoin running and the people that doesn't feel happy about the market spread bad news just to discourage others and also make it drop by force.
One thing about Bitcoin force is this, if the market want to run, there is nothing stopping it from doing it unless there is a heavy storm of news that is going to kill that hype and such news must be something the market hasn't experience before because right now, the market doesn't really fear anything from the main stream media, Bitcoin is standing on business now unlike back the where people do chicken out because of small news.