I think there could be a place for EK at LBA, possibly if they re-order the A350's or order some 787's/A330neo's. Having said that a 77L/77W could likely operate "no problem" from LBA, apart from taxiing a 77W at LBA might take a bit of careful nurture and getting used to, I've heard LBA can be tight.
Speaking of Emirates' waves, when is their third and smallest wave? But they are going to get a lot more complicated than they are now, I won't envy the poor guys in charge of organising it all when DWC opens