When Satoshi Nakamoto created the first bitcoin in January 2009, there were nearly 21 million coins left to be mined. As 80% of the total number of bitcoins have already been mined by January 13, there are only one-fifth of the capped supply that will be mined in the coming years.
Over 16.8 million bitcoins have now been mined by the miners worldwide and there will be another 4.2 million digital coins that is still left.
Number of Bitcoins Mined
January 15,2016 : 15,089,500 (71.8%)
January 15,2017 : 16,104,750 (77%)
As the remaining Bitcoins to be mined becomes smaller in number, the harder for it to mine. While Bitcoin is being introduce and gain more popularity throughout the society, it will have more demand and the price will keep on increasing as years goes by. I dont see any problem when in terms of the exchange price, the only issue with Bitcoin today is the slow transactions and high fees, And this is all because of the pressure for the miners to mine in a difficult level.