How many years Bitcoin will need to become No.1 ?
I'll take a guess on this one. If bitcoin reaches the speculation of $250,000 and $1,000,000 I think bitcoin will become the no. 1 currency depending on the value of currency in the circulation.This is showing that its a currency for the future. This graph is really showing acceptance in near future. We need to buy more coins. 
Just like what I'm saying before on what I have read that bitcoin is the future. Wherever is this graph came from, this is truly an amazing inspiration especially for those investors who are already giving up because of the past correction.