BA has a contractural obligation to the schools providing FPP thus they will be going ahead.
BMI slot in at the bottom of the MSL (potentially) and only add enough to continue to fly the aircraft the purchase bought with them. Thus the flying ratio per pilot remains unchanged.
The recruitment is being driven by the winter 2012/summer 2013 flying programme. At the moment there are not enough LH hulls to be able to convert the slots bought from BMI ito LH slots. As they become available (watch this space for a large twin order) then we will see LH expansion with the associated crewing uplift.