I initially thought the bitcoin futures will let the bitcoin price is relatively stable, but for now, when the bitcoin futures on-line, so the price of the bitcoin looks more like a be manipulated.
Only mass adoption will eventually lead to a stable market, and even when that happens manipulation will be possible, as it is possible on stocks, that are very liquid. That's why they have very strict regulation, to try to prevent there, and even with that, manipulation happens, so we will hardly ever have a completely free of manipulation market.
With futures, the market manipulation actually increased in my opinion, because we know have big sharks in an unregulated pool, full of fishes like us. It's a feast for them, and they will take advantage of that while they can. We can't fight them unless we hold our coins, and more people start moving in. Even all their money is less than the money of entire populations buying into the market. So only when mass adoption occurs, we will have a stable market.