It would be counterproductive for STL area folks to up and "boycott" AA because of the bad things that the ex-TWAers are having to go through as a result of the bad economy, Osama bin Laden, etc.. If STL-area people shift their allegiance to other carriers in large numbers, then AA would probably reduce its connecting traffic thru STL, which would add to the downward spiral of AA-related jobs based out of STL... it's like a self-fulfilling prophecy.
Regardless of whether one thinks that AA is unfairly targeting ex-TWAers (which I don't really think that they are), it's in your own interest to choose the carrier that offers you the best combination of price, connections, amenities, affinity programs, etc., whatever is most important to you, whether that be WN, AA or whoever. If you do choose AA, then in a way you are helping to support the return of STL-based AA jobs when the economy permits that to happen.
Based on the current outlook, I'd predict that STL will not be affected dispropotionately in AA's fall service cuts... all of AA's hubs will be affected to some extent. To some extent STL will get a boost because some Midwest cities that are currently served by both Eagle and American Connection are losing their Eagle service, meaning that more of that AA traffic will be routing thru STL (since presently American Connection only feeds STL).