We can't predict this, but I don't think it can be used by almost everyone in that year, to be honest.
It would take many more years to be accomplished this.
Or it won't really be used by everyone by any years to come. Bitcoin for now is known to be a currency for online users who is commonly associated to hyips and other investment scams online and no government wants to be associated by that kind of work. Also Btc has reached a pretty high amount of value it does not need a lot users to get to another higher amount.