There are fewer BF seats on the 787 than on the 767 or 777, correct? So if I have seat 5K on the 787 to LHR (in February -- hoping they've got the issues figured out by then, but if not...) and there is an equipment swap, wouldn't they just reassign me to another available BF seat in a different row number? There's no 5K on those other planes...
Why would someone lose a BF seat entirely if there's a swap to a plane with even more BF seats?
(I upgraded with miles, btw)