I have been thinking about a better model these past few weeks/months, I see it more as a decaying trendline of growth, (and just to give a ballpark idea, I'm guessing the trendline decays at around 30% growth rate per year).
Yes but this is not supported by anything but your imagination, so far. Maybe one day it will start slowing down, it did not yet, let's keep watching.
actually its supported by the actual trendline of bitcoin-
Year 1 of bitcoin it went from nothing to about $0.001
1 year later went to about $0.30 (a 300x increase)
another year later, it was about $6 (a 20x increase)
so I would say yeah, its supported by more than my imagination.