Even if the majority of the recipients all decide they're just gonna hang on to their Bitcoins and not sell, and in the best case scenario only less than 20% decide to sell, that's still 20% of about a billion. If too many sell around the same time, and it's not spread out enough, in the current state of the market with no strong confidence and low volume, that will probably still have an impact.
Now if a lot more people than that decide to sell, or the majority sells, we could be in for a pretty major drop.