The 'farts and darts' crowd in the blue suits community NEVER wanted or liked the 'Hawg'. It didn't cost zillions to design and build, it didn't need years/decades to iron out issues on, used 'old fashioned' steam gages to fly not 'geewhizzo' screens, and most importantly it didn't make a big smoke trail and expensive and an impressive BANG!!!! when it went off.

At one time, by multi sourcing GAU-8 rounds, the DoD got the per round cost down to under $25 per round, someone found out and it's back to single source 'pay whatever they ask' prices.
They pushed very hard to get them all to Air Guard units and then to the grinder, it's too bad that the pesky Gulf War 1 got in the way and the airplane and it's pilots got to show their stuff on worldwide TV, suddenly their carefully crafted plans to make the F-16 into an AF-16 ground attack aircraft went bye-bye.
Years ago the Army at Aberdeen P.G. developed a wire guided suitcase missile for battlefield use, it was named 'Copperhead' and used a small video camera to 'see' it's targets (tanks, helos, facilities, etc.) and could operate 'over a hill' it took about 30 minutes to teach any Sp4 who could fog a mirror how to use it and it was deadon accurate and lethal especially to armor. It, unfortunately was also dirt cheap to make and didn't make the required loud flash and noise when it went off-it got cancelled, this was around the time they were sinking billions into DIVAD which made all the requisite noises and flashes at huge expense until it was found out the 'shootdowns' were all rigged.
Retiring most (but not all) the Dragon Ladies makes sense since missions now run 14-16+ hours which is an excessive amount of time to sit on a block in a rubber bag and not be able to move, some pilots need to lifed out of the cockpit afterwards.
So we're back to bending over the desk and taking it dry on the 'never amount to anything' F-35.