So who and when is going to get out? And out where? To fiat currency that is controlled, inspected, can be frozen, taxed and stolen? Bitcoin grows like crazy because it is a money proved to work. It survived exchange hacks, stolen wallets, viruses, user mistakes, network-affecting software bugs and government seizures of bank deposits. It allows you to hold something in your pocket that nobody knows about and you can split it in 100 pieces and send to 100 people in different countries in a matter of seconds.
Bitcoin is not a promise of future delivery. Like William Gibson said, "The future is already here — it's just not very evenly distributed."