Even prior to the twitter hack, bitcoin has been called with so many names, like scams, ponzi schemes, being used by criminals (drug lords, terrorists) etc. And yet it still survived, get to a new all time high in 2017, suffers a long bearish trend, bounce back. In short it is very resilient and it's already proven that no matter what negativity they thrown, it doesn't have long term impact. So regardless if we have a twitter hack in the name of bitcoin, I don't see it's reputation being harm in the mainstream much worst than the media attacks back on 2016-2017.