I'm not sure I'd say that it will be the "killing of them" as I think that's a bit melodramatic. However, if rumours are true that bmi has sold all of BMed's slots to BA as part of the price for BA's short-term assent to the deal, then they will probably need to rob five or six short-haul slots a day to keep the BMed network flying; and then another three for their transatlantic aspirations.
That's nine a day. One can't help but think that this doesn't look like good news for the Embraer-operated routes ex LHR like TeesSide and Hannover, which would presumably be the first ones to be axed.