Selling everything can be good, but it also depends on the point if you think you will make more profit in the future, I would not do it.
I even think because of the halving the bitcoin will go to a much higher amount, after the halving has been done they people will sell of course and than its the point to sell them on the best moment to make a lot of profit.
Selling everything would only be a good thing if the investment was completely compromised. Most of the time, there are chances that the investment can recover its value. I think the percentage of assets to be sold should depend on the chances that this investment has to recover.
You got that right. Take for example what's happening to btc right now. I think there was a time when the price dropped to around 500+ but eventually btc was able to recover. And recover at a fast pace during the last months of 2016!So yeah I agree that at this rate, it's not wise to sell everything while the price is consistently going up. Better to hold to your btcs guys.