Bitcoin holders and miners are essentially the central banks of bitcoin economy. ...
What do you think?
I think your question illustrates your lack of understanding about the entire point of Bitcoin, that being the need for a decentralized currency that the market controls the value of instead of some central 'bank' or another. When a small cabal controls the value of a currency and the supply of that currency, that cabal has the power to take as much wealth as they wish to from those using said currency. So no, I don't think Bitcoin needs some cabal or another to control it's value, why do you? Do you hope to use the power of this proposed cabal of yours to essentially force the market to pay more for Bitcoin than it is worth?
Bitcoin is not fiat money system, no one can change the coin supply and fundamentals, but exchange is different, if you don't take control, a couple of institutional traders could take the control. I think that some kind of cushion is need to avoid violent shock in the price
I would rather see bitcoin price rise by 10-25% each month (following the difficulty rise), instead of a 2000% jump followed by a 75% dive. No matter how much times you have increased in value, a 100% drop will put you back to 0, and this could happen if the panics are large enough, especially when there is possibility to short the coin