What makes people compel to hold the bitcoin in this critical situation? What are they waiting for? Any good reason?
Keeping the bitcoin free from devaluation, and they are waiting for the price of bitumen to rise, they will sell off all bitcoin to capture a large profit.
Hope, because of hope. Everyone knows that the price will reach the sky in some years and the Bitcoins will be equal to millions. Another thing is that people know the segwit implementation will make Bitcoin stronger as a currency.