That's a pretty weird article, about these *Vietnam War-era Bell UH-1 utility and AH-1 attack helicopters*
The AH-1W was, for example, hardly "Viet Nam era" given it's two T-700 engines and improved weapons systems.
The Marines now have the UH-1Y and AH-1Z that are not "Viet Nam Era" - they reflect a considerable improvement to the state of the art of the Huey/Cobra line.
Granted, the Marines looking long term at the next big change in attack helicopter capability to match their Ospreys makes sense, in terms of being able to keep up with the V-22's.