The regression (or slow down as you put it) isn't an exclusive model for Ponzis however, it's also true of the adoption of many industries such as electricity, the motor car as well as the internet. I also don't need graphs or models to prove the obvious here  Nor should I need to explain that these industries remain very value-able as well as profitable.

Sometimes Ponzis exit scam at their peaks, such as Bitconnect, not necessarily once the slow down occurs. The other slight oversight is an exit scam requires a controlling majority of assets to be dumped, in order to effectively collapse the pyramid, due to the centralized nature of the scheme. Whereas with BTC I fail to see the controlling amount that could cause such a reaction. Hubo's 1.39% of supply doesn't quite cut it, even Satoshis upto 5% holding doesn't add up to 50% either. Big investors dumping a small percentage would only lead to a large correction (or complete liquidation), not exactly exit scam material.

Good to hear some long-term bears are still in town though, always bullish for the price long-term