The graph is in a log scale....this is good but I think in order to predict the future better we need to look at it as a sigmoid/logistic curve.
(That would support your theory of it slowing down later.)
Yeah, I wish I could make a sigmoid curve at the end, but I just wanted to point out that Bitcoin has the potential to reach, even considering a deceleration later, 1 million in 5 years.
That's 16 million BTC (2018) at US$ 1 million = US$ 16 trillion (Bitcoin M1).
Considering low single digits percentages of the US Debt, the derivatives, the safe havens, other countries economies (very important), speculative commodities and assets etc., it's seems plausible.
Because we're dealing with money here, it could take 1.5-2x longer, though. Even then, it's not the end of the world, you see.
I wonder if Bitcoin will be alive in 5 years
It's programmed to last forever.