Back in 1993 Alan Blinder's and Laura Tyson's view was that it was just too late to do anything about it: we had embarked on a path of becoming a trade deficit nation in order to finance the Reagan deficit, and that financing that budget deficit by borrowing abroad was a better option than crowding out domestic investment. There was a general belief that a weaker dollar (or "a stronger yen") would be a good thing, but that steps taken to obtain such a weaker dollar would scare off foreign investors--and that we badly needed those foreign investors to finance the deficit and hold the debt.
Now, of course, we still need the foreign investors to be willing to hold the debt on reasonable terms (and the debt is of *very* short duration, so the U.S. government is *very* vulnerable), and in addition--with the Bank of Japan and the Japanese government comatose, with European governments playing their contractionary-fiscal-policy-for-Maastricht game, and with the Bundesbank behaving as usual--someone has got to be the locomotive of aggregate demand for the world economy, and the U.S. seems to be picked for the role of importer of last resort.
I think people still worry about it. I think more people would worry about it if there didn't seem worse things to worry about first...
Brad DeLong