Temporary dips are very common in bull runs, that's the way the market works. After a big run there is always a small correction, and after that comes the next run. Don't be afraid and hodl your coins.
Yes. The people shouldn't worry about the market going down especially if they don't need money yet. The best move if the market goes down is to keep buying more coins and hold again and wait for it to become profitable.
Bitcoin price is gradually increasing and its a good sign that it will pump up soon and more profit to come too. Looking forward on the months to come, it will surely regain its price for the last quarter of 2017 and early 2018.
Bitcoin the most popular crypto currency, it will regain its position after the recent fall. In addition, the keroptional currency is not so stable that in 2018 we will see the fall and rise again more than once bitcoin