There should be 1 million people use bitcoin or blockchain technology, it will be more in the future, and the price will surge too.
Its hard to know the actual number using bitcoin but one thing is for sure, the users are slowly growing and soon it will be recognize by the world hopefully.
The number of bitcoin users is 2.5 millions. I found this information couple months ago on the net. But I think during this couple months the number increased. Bitcoin as money and as technology are getting more and more popular and used in daily life.