A lot of the speculation about bmi's future has been around VS but I wonder now that an openskies has been signed between Canada and UK whether AC would be interested in assuming some of the stakes in bmi.
When US/HP merged, both airlines weren't in great shape. AC pumped in $75 million which seemed like madness, but they have recently
sold a portion of the stake at a price which recoups almost all the investment. With that stake came agreement for AC Maintenance to do work for US/HP and Aeroplan to manage the FF programme.
LHR is
AC's largest overseas port (100 flights/week). Assuming Robert Milton could talk sense into MB (in a way LH and SK don't seem to have been), AC might gain similar concessions as at US/HP as well as bmi LHR slots for 5th freedom flights to Africa with their soon-to-arrive 777/787 fleet, a market they have no presence in but a lot of people in these parts visit.