the jewel in the crown has to be the wing design team, and whether they can coax the team into leaving too.
Indeed, about 40+ years ago, the BAC wing designers were being courted both by Boeing and the embryonic Airbus. They (rather, their employer) chose Airbus, of course. But if their jobs were seriously threatened by Airbus, I guess Boeing would come sniffing around again and many of these guys would soon be enjoying life in Seattle.
Or a nightmare scenario for Airbus would be for the talent to be scooped up by China.