Is it beyond the realms of possibility that when BA have added to the LGW airbus fleet that they might add service to LGW if the LCY service does well in addition to the LCY services ?
BA short haul seems predicated around burning
AVIOS points on leisure. They have moved away from many business and city routes with multiple frequencies in favour of second hand A320s with tight seating flying to sun destinations.
British Regional inherited the Manx monopoly on the move to LGW from LHR, thrice daily on a 146 on LGW-IOM. There was a conscious decision to sell this to flybe, it wasn't wanted. Nowadays LHR/LGW/LCY all have their own focus, I can't see a once daily A319 to IOM making sense as that would be almost wholly leisure. If BA CityFlyer ever got into LGW then perhaps but that's not going to happen anytime soon. All that would serve to do is undermine the weakest off peak LCY service or if they did do twice daily from LGW, swamp the market with capacity and drive down yields, again damaging LCY.