It is still very early to think that head of some state will officially support or even say something about BTC. In case, it will not affect BTC much. People will not suddenly start using BTC. First thing is to make it user friendly and free of bad reputation.
In my opinion, when amazon will start accepting BTC that will the most glorious day in BTC history. That will be a big landmark for bitcoin. Bitcoin value will rise upto 1500$ and amazon will have revisit there decision.
Except when the last few large companies started accepting btc (overstock, dell, etc) the price went DOWN. Its like a large selloff happening all at once cause they convert to fiat upon purchase. Even if amazon does ever accept btc, I dont see a large price increase. Seems liek a price increase only comes when there is massive BUYING and holding, usually sparked by news of economic collapse (like currently happening in greece)