although it is for sure that the price of bitcoin will cross 5000$, but no one know that how much time will it take. make one year or two even possible to cross the 5000$ limit in next 6 months. so these investors who are welling for long term investment they may be more calm and cold minded and they can hold bitcoin every for years but for short term investors it may not be so easy then become tired of holding bitcoin for so long and specially if the price remain stable for some time so for such people short term investment is really good idea.
As of now, there's no assurance that we will be heading at $5,000 because we still can't see the reality but as speculations. It will still be a speculation though we believe on it that time will come. And most of us investing in bitcoin the way we only hold it and it's already considered as investment.
We are just through speculations but if we think of the bitcoins posibility now even it is not yet happened we are confident that bitcoins will go through that price and over as the years go by .Even though its just an speculation but it is proven so the safe thing is to hold your coins in a more safe wallet or hardware wallet than to sell it thats why we are risking in investments.