More indications against the 'return to the mean' is that not a single chart will draw a line corresponding with the pre-bubble growth to the current $100, they all point to somewhere around $50.
This one (top) doesn't support the 'return to mean' theory:

Even if the 'correction/deflation' goes a fair bit below the line, I still don't see it going as far as $50, unless adoption is reaching saturation, which I doubt