I'm no expert, but with the forecasted increase in demand for air travel over the next 10+ years, I can't see the airlines, even with a merger, consolidate too much. I think a merger might be a great way to grow, without as much competition, thus opening more jobs.
I know the airlines do not always make sense, but NW, and DL are still hiring in pretty good numbers, and I can't imagine they would still be doing that, if they knew they were merging imminently, and would shrink/furlough. I also think retirements, although now are slowing things down, in five years, will once again be an issue.
I think mainline will probably take back some flying, but I still think the regionals will have a pretty big presence, especially for smaller to medium markets. I just think we are going to see a shift from 50 seat flying, to 70 seat prop, and jet flying.
I think we will see a slow down, at first, while things get hashed out, but I actually believe these mergers will/can be a very good thing for those in, and looking to get into this industry. We will see.