You should use your Bitcoins one day - but as off now, it would be a pure stupid move to sell your available coins. I could see the coins rise quite much in value in the next weeks - will it reach the 1000-mark in 2016 is too early to say, but indeed a possibility. It seems Bitcoins are getting a bigger audience, which means the demand on the coins increases. Simple demand/supply theory says the price will rise - so keep your coins close to you!