What actually matter is not the actual price, it's the trend.
If the price is stable or rising, the adoption increases. People and businesses get more confident in bitcoin and start using it. More miners start up their gears.
If the price is falling, people get scared / suspicious and will go away from bitcoin.
The price is what starts everything with Bitcoins and is the most important thing there is I can think of when it is about Bitcoin. If the price is nice and high then people will sell there coins.
Well there have been down from the past and a lot of them stopped from doing this kind of thing. The price will also be considered as always. They see something not going well and they go.