I said one, or several, in my post. No reason to stress "one". I called them manipulators only to follow your lead. Call it what you want, pegging the exchange rate is manipulation, even if it is benevolent.
Of course pegging the bitcoin to fiat is manipulation. I never said it wasn't. And despite that obvious fact, mining an exact amount of bitcoin per hour is also manipulation, but then again, who cares? And I do believe it could be considered more benevolent or neutral if a pegged price is the specific expectation of the exchangers until all coin are distributed, at least for initial exchange stability.
Either way, if you upset your clientele, they'll bail. It would be akin to paypal arbitrarily quadrupling their fees. It's probable you'll have detractors. It might even sound their death knell. We can only hope. However, if you use "smart property" where the trust has to be shared (the pegged price agreement), it's not likely any one or all the exchanges will collude to screw everybody else. The same could be said for the bitcoin network. No one group is typically large enough to affect the rest, and they aren't incentivized in that way in the first place. Better have something, than risk everything for nothing.
First of all, I don't think your idea will fly, simply because there is too much trust that the exchanges will do what they say. "Expenses and a fluctuating dollar has forced us to change our rate, don't worry, we did an internal vote and decided it was best for the future of the currency." And if you think people complain about early adopters now, wait until a single entity starts with every coin in existence.
Did you you read the smart property or digital contract proposal? It's shared federated trust servers. The Open Transaction project by Traveler could work in a similar fashion. The single entity with all the initial coin will be mitigated by the aformentioned arrangement (he would seek federated partnerships to protect against centralization whilst simultaneously gaining limited liability from aggresive government control).
The idea is to quickly disseminate and put into the hands of as many exchangers the entirety of the coinage, and then force them to authenticate each other when they spend (via fiat) the coin into the economy (or they can't spend it at all). It certainly simplifies things when you have one price. No need to second guess, speculate, have charts, do averages, hedge, or leverage. In addition options and futures contracts come much later if even needed.
Finally, if you manage to go so far as to get this system up and running, I suspect when the day comes that you finally have to float against the other currencies of the world, you will experience extreme volatility, and it will affect everyone involved in a much larger way because the previous regulation dulled their senses into thinking stability was part of the design.
Really? How's that possible? You'll have $21 trillion worth of coin floating around. Nobody's going to push that around very easily. Contrast that with now and somebody with 100K BTC. It's easy to manipulate that market. Are you counting on somebody cornering 1 trillion or two to create similar volatility. Sure...
I admire your goals, I just don't agree with how you are trying to achieve them. I will be surprised if you manage to pull if off in the way you suggest. And I'll be happy to admit I was wrong.
Unfortunately, I'm going to have to brush up on my math skills or hire somebody to hammer out the details. Just trying to improve the opportunities and wrest the power away from the state. No small task I would assume. Discussion always gets me thinking.