Not to take away from the excellent analysis, but isn't that a problem for just about every LGW long-haul route?

Where there is a high level of O&D, potentially price sensitive travellers who may nevertheless be willing to pay a premium for non-stop (i.e., relatively expensive I, T, and <N fares, but relatively few in higher fare buckets) and potentially long flights (South America, Caribbean, Indian Ocean, maybe eventually Thailand/Bali?) isn't every single LGW route ideal for a 787 or 350 and absolutely terrible for a 777? In fact, isn't a 777 pretty terrible for everywhere except the East Coast and Middle East?

Is BA looking at moving away from 777s in Gatwick any time soon?