As the bitcoin grows bigger, the bad events like the Bitfinex hack will grow smaller. The lost coin is just 120k, lower than the MT Gox 800.000.
Whether Bitcoin grows bigger is obviously irrelevant to the effect of hacks like that of Bitfinex (in relative terms). You evidently forget that the number of coins is still ultimately limited to 21M. Strictly speaking, after reaching that limit (in fact, even before that) the number of coins in circulation, i.e. primarily used for trading, will start to diminish (e.g. due to coins lost or stashed for good) with all ensuing consequences. In other words, even lesser amount of stolen bitcoins will have greater effect on the Bitcoin price, quite contrary to what you are claiming...
And in no case you can get away from this simple arithmetic
It may have a huge effect in this coming days or months but eventually this hack will be forgotten and the bitcoin economy will continue to bloom. Just what happened in the previous years. Besides it is not the bitcoin security fault but the security of the site that faulter. As long as people believe and use bitcoin, development and security is evolving, confirmation issue fixed, Bitcoineconoy will continue to flourish.