The question is whether they will stick to their stated commitment.  They can say that now, but if things don't work out in two or three years, they can easily say something unexpected that goes against their pledge.  I think they think that because they seen Germany's success with the Bitcoins they received, they should follow suit if they can.  The length of time they will be holding it is what I question.  Twenty years?  That's perfectly acceptable, but I doubt they'll actually do it.  Additionally, they would be able to control the price of Bitcoin on their own initiative because they will know that we only have a