Each person own 1 Bitcoin and hold on to it for 20+ years.
Bitcoin is the best investment of all time. Owning Bitcoin is better than owning a house.
Indeed, anyone not owning at least 1 BTC by 2016 is doing extremely wrong, specially if this person has been on this forum for a while.
And about 21 trillion dollars for 1 million per coin, I don't think marketcaps are calculated that way. It would actually take less trillions to reach 1 million per coin.
It's perfectly possible to reach 1 million per coin over the next decade or two. Gold has trillions invested, and only some of this migrating into Bitcoin will make the price explode, since the marketcap of today is super tiny.