I don't think that it is possible to stable Bitcoin because it is not under the control of anyone.It is used by the entire world and its pirce depends upon the investors from the entire world.At a particular time some investors will hold and at the same time some will be selling there stock.Some will hold and will want the price to rise and some will want a drop so that they can buy more at lower price which will lead to the fluctuations in the price.So it is not possible that every investor will have a same mind set.So I don't think that it can become stable.