I too think Willy has a massive hidden motive for this. Here's my prediction.
BA pilots vote 90%+ for IA.
BALPA and BA go back to talks
During the talks OS is 'postponed' indefinitely and fault put at BALPA's door
BA buy BMI
BA tell BALPA that all SH is now on BMI T&C's or SH is canned for good
Carnage.
Happy to see if I'm right in 3 months time.