Through observing the bitcoin market for a number of years, a lot of money is made in the parabolic moves up yet also during the aggressive pullbacks. Historically, after a bitcoin a pump there's always been a return to the 200 EMA (normally quite quickly) accounting for ~35-40% drop.
Elliott Wave analysis signals we're coming to the end of wave 3, which should take us to $5,000. Respecting the cycle of ~40% pullbacks, we should see capitulation to $3,000; then the 5th wave should take us $10,000. This is a psychologically very attractive take profit area for investors on a large scale. If Elliott Wave is correct this would complete a larger 3rd wave (1st being to 1.1k back in 2013; 2nd being the pullback to ~$200 ending at the start of 2015), and a large 4th wave correction could provide a bear market over an extended period with price targets around the $2,500 area.
Following the curve upwards, with the 200 EMA providing support - I would find it very surprising to see the BTC rally stopping anytime soon; and long term investors should be happy holding as long as they have strong enough hands to ride the regular shakeouts in the BTC market.