I fail to see what relevance the unfortunate mis-routing of a B777 onto the grass has to do with BHXs' capability or otherwise of handling A380s.
It hasn't but look further down the line when EK decide to do their forward planning and decide future plans. As discussed in the BHX thread many people have stated that the infrastructure is not in place, ie wider taxiways, runway etc.
Having once worked in flt ops planning many moons ago infrastructure concerns are always raised when planning routes. In other words can the airport cope.