Now that we're out of Afghanistan, it will be interesting to see what becomes of those fleets. We don't have a good track record of supporting "novel / niche" weapons systems (see C-27). Also, guess we've already retired 2/3rds of the C-145 fleet?
Some US-2 specs from Wikipedia below. Hard to put a lot of stock into them, since it is Wikipedia, and so much of the performance depends on loading. But I wouldn't have expected the US-2 to have a 2,500 nmi range. Impressive. Also, would have to imagine hanging all the enormous amphibian gear off the C-130 will have a big hit on its performance.
The US-2 needs a congressional caucus to go bat for it. Gather up a couple ANG units in coastal states that are in danger of losing their iron. Pick a US defense contractor in an under-served state to provide the modifications needed to bring it up to our desired specs, etc. You know, throw some money and power around.
US-2
Maximum speed: 300 kn
Cruise speed: 260 kn
Range: 2,500 nmi