What is GLA losing out on? :/ The rote is hardly in decline. At worst it has been flat on growth however fares have remained consistent and loads in the front two cabins have remained consistent. And GLA's lead in/ base fare is still higher than all other UK EK departure points.
EK aren't worried about EY and QR in Scotland and not should they be when you look at how heavily they are having to discount, coupled with below average loads.
I don't think those leading EK need a few spotters to tell them if a route is worthy of more capacity or not. If EK say a GLA A380 is just a matter of time, I'll take their word for that.