The problem is if any bases were over crewed then those displaced would cause base transfer lists to be frozen and will be given priority on regional bases when some of have been waiting years to get home will be stuck away for a long time to come. For purely selfish reasons I hope we do not get involved with MON. Besides it would be odd to see those who left us for the green grass of MON return to the big easy.
I could see some people unhappy about the pension situation if they had a FSP when the rest of us have a pretty crappy deal but those would be in the minority. If any widespread animosity occurred it would be if the share price were damaged by it. With the shares people are worryingly short sighted. They would not see the long term potential benefits of a merger and they will only see the headlines and the initial share price drop which they will not forget.