Starting from March 16 crowds of greedy inexperienced people (zombies) rush for bitcoin because of "As Seen on TV" factor.
They don't realize what bitcoin is and how does it work, the only thing they believe is that it is everlastingly deflating and profitable.
But every bubble has its peak and then crash.
To start the crash it's only necessary to make a prime time TV show telling a horror story, something like
"poor single mother sold everything to buy BTC at $200 and then committed suicide after it dropped to $150".
Bump! And hordes of greedy zombies are running to sell sell sell in panic.
However, bitcoin will not die. Just a year later the bubble will happen again, then again, and again. I'd say Perpetum Bubble
What needs to happen is somebody (preferably somebody large with money) to say "I'll buy bitcoins for $x. Not any more than $x, I'm not gonna facilitate a bubble. But I'll buy them at $x." That would truly support the currency in the long term. Also it could make that person a fair amount of money on every bubble as he is essentially always buying at the bottom.