I think the model is broken.  And it is going to drive the price of bitcoin sky high.

The reason is the only way retail and institutional investors can get exposure to Bitcoin is through futures. So futures are being used as a substitute for an ETF.  Which is going to blow the price of futures sky high as people FOMO.  

Which means a roaring arbitrage trade will develop with the exchanges. But the cost of funds of being a shorter will spiral out of control due to constant margin calls on the shorts who will have to pour in more fiat. Which will restrict supply, driving the cost higher.   So we should expect an ever increasing divergence between the future price and the exchange price.