A couple things bother me with the question, and it's not with the poster by any means, just the question its self. I think it is really premature at this point to even think about something like that. I just got this feeling that once talk like this starts, it ends up snowballing into something or giving corporate an idea to try to push this.
I'm not really sure you can compare UPS with the situation the big 3 are in. The big 3 started down the road they are on several years ago, when they were flooding the market with unrealistic incentives on vehicle's. The big 3 it seems are their own worst enemy. Corporate luxuries, excessive CEO pay and bonus's. They were living for the day and not the future. Mismanagement I think is the major culprit with the big 3.
Every driver, loader, unloader, mechanic, etc, works there butts off for what they make. Cutting pay and being expected to maintain the same results is not really fair to anybody. I just don't think this is the appropriate time to even consider something like this.