Very well said! I think it is not quite possible that everyone just start using Bitcoin and that too in such a short time period. Still there are so many who are unaware of this concept of digital currency.
It will take quite long time for everyone to know about this thing. Yes, there are very much chances that number of investors will definitely increase by 2022.
I don't think the problem here is the "small" time window until 2022. Bitcoin is being talked all over the world now, so people are getting aware. The problem is that bitcoin is following the path of investment and not "common currency". The fees are just to high for common use right now. We are seeing merchants withdrawing from bitcoin and not getting into it, simply because it's to expensive to maintain a business like that, when they can do the same with paypal for example.
I'm sure investors will continue to come, because the use of bitcoin as "gold" is getting popular though. If the time of transactions is solved, and the fees drop, then we will a lot of people using BTC in 2022.
Yes Bitcoins will be definitely used by almost everyone in year 2022 because now a days Bitcoins are getting more and more popularity just because of its unstoppable increasing price there for in 100% sure that BTC will be used by everyone in year 2022.