US Dollar: on a long term decline, but stabilized recently:
Treasury yields: creeping lower:
Gold: as Sorros said: in a bull market:
US Stocks: sideways for the last decade:
It'll take strong, multi-year moves in each of these asset classes to change these long term trends. I'm not an economist, just a trader who's job it is to make money, but by simply looking at these charts, I can see, where guys like Nouriel Roubini are coming from.