The above paragraph comes from Air Force Association's Daily Update. The Air National Guard (ANG) in the beginning flew older airframes that had already been phased out of the active inventory. The ANG was able to slowly change the state of the inventory from antiques to same aircraft as those flown by active duty. The shift in airframes allowed the ANG to transition from a training reserve to a strategic reserve. The last Base Realignment and Closure (BRAC) harvested many of these newer airframes from the ANG to increase the numbers on active duty. For example, the active duty Air Force had a larger number of older C-130E models compared to the newer C-130H and C-130J aircraft at ANG units. The ANG bases or units with these newer airframes were closed.
F-16s didn't present as critical a need for the USAF so more of these units remained in the ANG. It appears now these units will be left with a huge gap. Long before 9/11, the ANG had the responsibility of maintaining the air sovereignty of the United States. The long delay in going from F-16 to F-35 will compromise the air sovereignty and security of the homeland.
I fear this trends means the ANG will one day cease to exist as we know it. The ANG has demonstrated its ability to perform combat missions going back to the Vietnam War. To lose this cost effective means of supplementing our air superiority is risky at best.