Bitcoins were introduced in 2009 but it became viral over the world in recent 2015 and now each and every person knows about it............ As learned in schools and business, when supply decreases, demand increases and price increases........Bitcoin is like a chameleon changing its price at seconds . No one can assure what will happen ....At NOV 2009 a bitcoin was worth 2 US dollars and in NOV 2013 it was 1000 US dollars per bitcoin........... So what is the future ? what is the prediction?

Well, that was 4 years of difference. In 2009, bitcoin was just released. People are full of doubt, and didn't believe in it. Mostly people who are into computers are the ones who invested in bitcoins. When the modern technology took over, of course a lot of people have become aware of bitcoins. A lot of people wanted to invest, so the price has increased a lot.
Now, like you've said, almost everybody knows about bitcoin. Unfortunately, there's no more force that pushes people to invest a lot of money in bitcoins. Bitcoin isn't a thing anymore or maybe just yet. We don't know when would it sky rocket again so always watch the chart everyday.