The reasons for bitcoin drop might be very simple. Many people and institutions invested their money there and they would like to get back some share of the investment. It seems that quite a few people are impatient or is willing to monetize now, even at this relatively low price compared to recent peaks in December and January.

The real push for the bitcoin price would be mass adoption in the means of a self sustainable ecosystem, where you earn and spend only BTC without the need to exchange it for fiat. Some analysts say it would not happen as BTC is relatively easy to hack with enough hashpower that few Chineese mines do posess.