Part One was pulled because it was a load of old ****.
BA were happy to fly ABZ-LHR as it feeds the long haul routes from London. BMI only have a fraction of the LHR passengers as they fly the ERJ145 as a general slot holder for the London end.
BA's LGW-ABZ was pulled because the oil traffic route to Houston moved to Heathrow. Hence they now feed more high yield oil traffic through Terminal 5.
There are still a good few connections each day and a competitor on the route, with the option of BE to LGW or EZY to LTN. Get some perspective, you'd think they'd rebuilt Hadrians Wall the way some were throwing toys from the pram!
BA is a profit making company with shareholders and facing a bloody tough time. It's not a state concern and this isn't 1979. ( well actually (!) )
Goodness me, so long as BMI are still there, there's little problem surely.