Its already happening with EK A380s, what is it now 4 a day with possibly a 5th ? Do you really think all those pax are going to DXB only ? Like hell they are !
So not a daft argument just looking ahead thats all.
OK, not daft, I just think you are extrapolating a projection too far.
If capacity in London is constrained, then it would be logical to expect the average aircraft size on any route to move upwards, but the biggest birds would still generally be the ones that were going to fly the furthest.
So if the European hub carriers (and why not SK, OS, LX etc) all upgraded to the A380, why not all routes? That would give you 186m pax per year, assuming the same number of movements, standard 3 class config and 70% LF.
Obviously, this isn't going to happen. What will happen is that airlines will use other airports apart from LHR if they want to feed their hubs. So as for those EK 380's, that is only part of the picture, as they also serve LGW, BHX, NCL & MAN too (in England). What were LH's aims with their LGW-FRA route?