I agree with you that the question of a second runway for LGW will likely resurface at some point in the future. But at this point carriers must plan around a single runway operation there for the long term.
With regards to incentive-deals offered by airport operators to airlines, one must consider that even a 'no-fees' deal represents a very small saving set against the overall cost of operating a daily long-haul schedule on a full-service basis. Fuel, wages, depreciation, maintenance, nav charges, catering, insurance, handling, marketing, admin ... tick off all of these and the rest and the fee paid to an airport such as LGW only affects costs on a small scale at the margins. Of course, airlines appreciate any saving offered, but an incentive which would seem very generous from the airport's perspective could in reality be virtually inconsequential to the carrier. Probably insufficient to decide the choice between two potential long-haul routes.
With regards to incentive-deals offered by airport operators to airlines, one must consider that even a 'no-fees' deal represents a very small saving set against the overall cost of operating a daily long-haul schedule on a full-service basis. Fuel, wages, depreciation, maintenance, nav charges, catering, insurance, handling, marketing, admin ... tick off all of these and the rest and the fee paid to an airport such as LGW only affects costs on a small scale at the margins. Of course, airlines appreciate any saving offered, but an incentive which would seem very generous from the airport's perspective could in reality be virtually inconsequential to the carrier. Probably insufficient to decide the choice between two potential long-haul routes.