Evenelplus,
As others have stated the A380 has been into BHX on a sched flt albeit with only 3/4 passengers to DXB. However the only reason for that is if it was cancelled or tech they could fit on ar B77W.
As its only a 7 hr flt could probably operate with a full passenger load and the required fuel for a relitively short long haul off the current runway length.
I too can see a 3rd EK and if their model continues as theit MAN operation build up, probably the lunch flight would become 3 class with 1st class points.
I doubt very much that EK would pull out of BHX if Qatar arrived (they would only be using a 788/332), and EK have 90% load factors so its not a marginal service !
However it would probably effect our second flight or scupper a 3rd flt.
However as Gettonnitt says, any chance of Qatar was wiped away when they joined One World, who don't do BHX.
So it might be a 1 trick pony but would settle for a 3rd EK flight.
Nigel