After its launch few years before, bitcoin raised its value from beings few dollars to more than 1000 dollars by 2012. According to an investor this price variation is too fragile. I do agree that bitcoin might still be in its infancy due to much variation going on..
I don't think it is so much the price, but is rather the stability of the network. There are still a number of ways that a well funded attacker could attempt to attack the bitcoin network and wreck havoc on the bitcoin network and on bitcoin itself.