If they do decide to buy-back in, (fear of missing the pump train), then they certainly would not try to recover all of their coins back. More logically, the thinking would go something like this.
Oh man, I lost 15K worth of BTC. That was what I was willing to loose, it was only 1-2% of my total worth. I want to enter into the market, but I am cautious, I don't want to get hurt again. This time, I will only put in maybe 5k and see how it goes.
So yes there might be some extra buyers, but not enough to continue a drive upwards long-term. Please note that this comment does not reflect my prediction for the price, as I still see there is more manipulation upward to be had. This is just a take on investigating your logic.
There are no "average actors", people do not act as a homogenous whole. It is not a case of "will people do X or Y" but how many will do each.
I this case, peoples Bitcoins have been taken. They can't sell them and make the price go down. It only takes a fraction buying back to help things move up.
The only way it could affect the price negatively would be to discourage people from holding bitcoins and doubtless those who were not involved in the Gox debacle are thinking "it won't happen to me" as much as those who had funds on Gox were before the event.
CCMF