Originally Posted by
Bagso
especially as yields from 1st class should not be a factor.
Why not? That is precisely the attraction of London (though it required so as to cover the greater costs of operating these).
If it makes money, someone will do it - but don't bank on the network being there as an attraction. It has to be sustainable from a local point of view to be worth doing - as Austrian Airlines have proven by now withdrawing from longhaul travel. India/Pakistan - possible - but consider that market is already taken care of by some airlines.