And why you are quoting this guy talking about ethereum? He is just talking about the people who is investing on bitcoin and how they are adopting it.
I’d suggest you should invest in Ether. The name might sound new and you might not know much about this cryptocurrency either. But as unthinkable as it sounds, Ether is the second most popular cryptocurrency
Anyway, i dont think that the quantity of users who are using bitcoin gets doubled every 12 months, that is a lot of time..
Maybe it is less than three months, how can you explain tha the price increased by more than ten times during this year? There is no way to explain that if you said that the bitcoin population doubles by itself in just a year.