I personally dont see tariffs as a solution. Tariffs would work only to a degree. Tit for tat restrictions result in competing countries, with the end result that uncompetitive industries end up being subsidized by the consumer for domestic political reasons.
What really needs to be done to get world trade back on a level playing field and to restore USAs economy is to replace the $US as the worlds default trading currency with something more soundly based.
Lots of ideas are being kicked around at the moment. A return to the gold standard has been ruled out as there just isn't enough of the stuff to go around these days and an increase to 20 or $30 thousand and ounce (or perhaps a lot more), would be inequitable to many countries who sold off their gold reserves in exchange for $US reserves. The Euro has been proposed as a contender for the crown. But same old problems with using paper money fiat currency as occurred with USA. Then there's the concept of using a basket of major currencies. Again, open to manipulation if one country wishes to hold its currency value down in order to gain a competitive edge.
I believe we should get back to the basics of what wealth actually is rather than playing with funny money fiat currencies. True wealth is not paper money but actual production of goods and services that people can use to enhance their lives. We already have very good ways of measuring that, --- its called GDP. But how to value GDP if governments are going to squander the countries profitable labour on things such as wars or irresponsible social policies. Well, we already have a good way of measuring that too. Its called the government deficit or surplus. But what if a country has a good growth rate of GDP but a negative trade balance due to domestic demand? Well, that can quite easily figured into the equation too. It aint rocket science. If we can put a man on the moon back in '68, we can surely work out a formula to accurately gauge the value of a countries productive capacity in 2010.
Such a system wouldn't be perfect as countries would try to cheat the system for their own benefit as they always have done and always will do. But it would be impossible for any one nation to rort the system to the same extent as has happened under the $US hegemony. China and USA, though at opposite ends of the scale, being prime examples of how the current experiment of the past 39 years can be exploited.
Its something that has got to happen in some shape or form and surely will happen, -- probably within the next decade. Its going to involve a lot of redistribution of wealth among the worlds countries. And a devaluation of the $US would be the best thing that could happen to the people of USA.