Could a "doc fix" have a bigger impact on U.S. healthcare than the ACA?

Two interrelated features of the U.S. healthcare system are probably the primary causes for the uniquely high cost of healthcare in the U.S.: weak government control over pricing, and the fee-for-service payment model.

These interrelated weaknesses are exacerbated, as a weekend Washington Post exposé showed, in that Medicare pretty much lets doctors determine the rates at which they paid, by leaving it to the AMA to produce estimates of how long each procedure takes. Surprise! The doctors' chief trade group massively pads the estimated times required for most procedures. 

Even if procedure prices were based on accurate time estimates, free-for-service incentivizes providers to perform a high volume of the most expensive procedures. Nonetheless, countries in which the government imposes monopsony price control -- i.e., every other wealthy country in the world -- generally manage to deliver universal healthcare at two thirds to half the cost per capita of healthcare in the U.S.  Government control over pricing, as Ezra Klein recently forced healthcare free market evangelist Avik Roy to admit, is the sine qua non of effective heathcare cost control.  And we in the U.S. don't have it, as a study published in Health Affairs ("It's the Prices, Stupid...", Gerard F. Anderson et al., 2003) explains: