I don't know about US, but some other countries have noticed the pattern and revived some old designs. For example, apparently, turboprop bomber/assault aircraft are nearly perfect for "anti-insurgency" type of combat missions as seen in Iraq and Afghanistan - cheap, rugged, easy to operate, can take off and land from small and poorly maintained airstrips... and still more than capable of delivering death in droves from the sky while remaining effectively untouched.
US itself has AC-130, which, I suppose, kinda fits that role as well, even if it wasn't originally designed for it.