The USAF want to create a single fighter that can do 'everything'. The idea is that you now can standardize on maintenance, parts, etc ... reduce overall TCO.Everything you wrote supports the retiring of old, difficult to maintain, obsolete aircraft.
Modern, low observable aircraft fitted with stand-off capability weapons are the way forward for the USAF. Retire the A-10 and use the money saved to buy more new aircraft, either F-15Es or F-35s And, air support needs to be owned and controlled at the lowest level possible. Attack helicopters are organic to the division and corps, so when the division CG wants air support he has is own assets, he does not have to go all the way up to the joint command and ask for help. Helicopters also have the ability the hover, masked by terrain, and still maintain the ability to fire on the enemy with mast mounted sensors, or with a quick pop-up maneuver that offers far less exposure to enemy fire. And, they can ground loiter almost indefinitely.
What's the point? What worked 50 years ago, might not be the best choice in today's battle.