You have to evaluate, the reason that you bought the btc in the first place.   Was it because you wanted to be part of something new?   Did you want to be a participant in a vehicle that has the potential to change the financial world as we know it?   Or were you just hoping to double your money in a few days/weeks/months?  Also you need to evaluate if it could affect your life if the value halved again, or even worse.  

If the value plummeting could adversely affect your life, or make you lose sleep, then maybe selling is the best option for you.   If it was the latter, and you want to be a part of the bigger picture, then definitely hold.   There is definitely still the potential for massive growth, it is just starting to look like it is on a much bigger timetable than most had hoped.  

If you bought only a few btc, and your idea was to  get rich quick, then that idea is pretty much out the window for the time being.   That doesn't mean that you are not going to make long term gains on the investment, however.   Keep in mind that a 10-12% return on a stock market investment is still considered strong.  You can still reap those returns on any given day in the btc market.