It's likely that there are a lot of people on the sidelines waiting for a clear breakout (up or down) out of this $1000 area and once something causes that to happen (and that something could be some random big buyer or seller that happens to move the market since BTC market is still pretty illiquid), everyone will pile on to either take price to the next level ($2,000 for example) or sell BTC down to oblivion.