The NWA mechanics strike was over, they were either placed on the bottom of the seniority list or out on the street. I use to think the same way you do, until the NWA mechanics were replaced. I don't think that AA executives have a bigger heart then NWA executives.
I think executives can be even more ruthless. APFA knows AA well and will use that knowledge as they have in the past. They will play there adversary very carefully. In 93 with a limited threat of replacements they limited the strike duration to under the time it would take to train and replace anyone. There are other ways to play this. Add in the possibility that the pilots or the mechanics/ fleet service do even as little as work to rule there is another big wrench for AA to deal with. Both of those other unions were very helpful in the past and I now if and when the tables are turned the FA's will do what they can for them.
The greatest weapon APFA has is the arrogance of AA management. It has served us very well in the past and hasnt changed much over the years.