CAS is great--so long as you own the airspace the CAS bird is operating in. Keeping the skies clear of enemy air remains the primary job of the Air Force. The F-35 is out there to replace the F-16s and F-18s. While CAS has always been an important mission for the Air Force, it is not the only mission. First and foremost has always been Air Superiority if not outright Air Dominance. It's been sixty years since an enemy aircraft actually succeeded in killing US troops on the ground (not counting 9/11) and that was not a coordinated campaign against us. And that's because the US made a concerted effort to destroy the enemy's air force before they could hit us. You don't do that with a collection of aircraft dedicated to nothing but CAS.
Most of the decisions made about weapons procurement are meant to be about future wars, not the ones we fight today. The big concern nowadays is about China and the so-called "Pacific Pivot." China's PLAAF is not the same air force it was just ten years ago, and they're growing their capabilities every day. To underestimate their ability would be a big mistake. We're not dealing with the Soviet Union, yet, but the potential is definitely there.
While getting rid of the A-10 before the F-35 is fully tested is, in my mind, as huge mistake, the powers that be are counting dollars, not the lives it could well cost to mothball the platform. And, to be honest, the idea to me smacks of the AF playing politics by using the AF Guard to get congress to do what they want. "Give us more money or these fifteen states will lose this many jobs!" Will the A-10 get sent to the Boneyard? Sooner or later, sure. But my money will be on "later."
I agree with most of what you posted. However, I for one, never said or suggested that CAS is the end all be all. I understand the need along with the difference between superiority and dominance and how one leads to another.
With that said, while the welcome of a PGM inbound is a warm fuzzy, something on station that has loiter capabilities to the extent of "What ya need boys?" vs "Here I come with my 180 million dollar platform" one minute and gone the next, I'll take the former over the latter any day, any minute, w/o question.
The cost over runs for the 35 have cost not only the AF, but other services as well. My gut tells me we're too far into it to cut it loose.