One-week study re-affirms A-10 retirement decision: USAF - 3/6/2015 - Flight Global
The linked Flightglobal report suggests that there will be no reprieve for the A10. It looks like its CAS role will pass to F16/F15 until F35 is available in sufficient numbers. The report suggests that F35's part in low-end CAS will then decrease as its evolution advances. After that, the USAF may be open to an additional lower cost asset (eg Textron AirLand Scorpion) for use in more permissive environments.
LF