when youre talking about conducting two wars simultaneously, in the case of the US it would be low level wars against 3rd world nations -
because any modern army would inflict high casualties..

the real question is not technological superiority, but rather the willingness of the US population to absorb high casualties and high taxes that are part of the package. In the case of Iraq, the Bush administration still played on the fear after 9/11. but had not 9/11 occurred it unlikely that there would be much support for an optional war.