1. Are they cheap or are they old? You point out the last airframes came off the production lines 30 years ago then say they were built cheaply. I do not think still being operational decades later, especially considering their operational tempo over most of this time, is indicative of cheap.
2. Pork wing program or falling apart? If they are 'falling apart' then I do not think a program to remediate that would be considered pork.
3. A bunch were lost in 2003? Please enumerate. I know of only one combat loss of an A-10 in Iraq since 2003.
4. The A-10 has a slightly lower rate of blue-on-blue incidents than other aircraft performing close air support. In any case, the numbers of friendly fire incidents by aircraft of any type are astonishingly low compared to the number of sorties flown. Statistically minimal.
5. What WWII CAS aircraft exceeded the A-10 in speed? The big CAS birds of that war, Junkers 87 and the II-2 were both a couple hundred miles per hour slower. The P-47 was at least in the same ball park as the A-10.
6. How often is a CAS mission called for and time from base is a factor? Fine, in that case send a Strike Eagle. For all the other times, that loitering plane is ready to go no matter if it is sub or supersonic.
7. A-10 was designed to not need full size airbases. Strong gear. High engines. Soft tires. They are made to work from short, damaged and improvised fields.
So what are the really capable CAS aircraft existing today?
Why do grunts and marines commonly differ with you?