One day you won't be able to exchange BTC for any real money cause Governments and NWO will shut down exchangers and nobody is going to trade with you face to face in fear of under cover raid.
Actually BTC could probably become illegal just like other certain stuff that is illegal to possess on your hard drive. So make sure you have it encrypted (TrueCrypt is free and very good) with a huge 50+ character password including symbols and numbers to make it impossible to brute force in 1000 years, else if they find your BTC wallet you'd probably get 25 to Life for conspiracy to over throw Governments and NWO, labeled as national security risk, and put on no fly list.
Yes, this is our future. Sticking your head in the sand, or putting your fingers in your ears going "la la la..." won't stop it from happening. Some day, you'll wake up.
For the people doing BTC as an investment to make money, the time to cash out is not before the next crash, or the crash after that, but to cash out before you can't cash out anymore, regardless of value. But heck, even if you cash out the day before, nothing to stop the government from tracking and logging whats been going on for a while, and freezing bank accounts from everyone associated with BTC exchangers, etc. Oh can't happen? Look at Liberty Reserve.