I don't think the future for the US is unpredictable at all. I think it's very clear-cut, that THIS time, the "Titanic" is going down for good.
The ultimate "Ponsi scheme", in history, has been the U.S. FIAT currency economy, for going on 40 years now. As we all know from Ponsi schemes, eventually, you run out of people willing to "come in" from the bottom. How can a bank take a deposit, and "magically" now loan out almost 40 TIMES as much money as they actually received? They did such a good job of it, that they sucked in the whole world. We are just about there now, but not quite yet to the end. I'm just sorry it appears that it has to happen in my lifetime, but it's inevitable, and much closer than we think.
Not to go religious on you, and I'm not going to preach, but read the book of Revelation, chapter 18. My (broken) heart says that whole chapter is talking about the US of A, as John saw it in the actual future, and translated it into terms a person of his time could understand....
Ok, enough doom and gloom for now, sorry.