Is there a way to determine the number of people who are actually using Bitcoin till date? Who would have access to such information? Meaning a way to find out, how many new people have used Bitcoin in 2016 , so that we can say exponential growth is natural not artificially created by hoarders.
in my opinion it is not easy to predict whether any particular number of people using bitcoin .
because every user has multiple adress , multiple wallet and also many bitcoin services account , so we can't predict of find out how many persons are involve in the bitcoin .
And even in future we won't be able to find how many people are using it as we cannot go to each and everyone and ask whether they are using bitcoins or not and I think its a waste of time.