I get the impression that skipness doesn't care tbh
For the record I never said a LHR route would ever be launched, however if one existed it would be well used both by locals and tourists and business alike.
What Cornwall/ NQY lack is connectivity. Why a LHR would bring to nqy/cornwall is connectivity. Will it be the best domestic route ex LHR no, probably the worse.
However the quoted BA LGW route as pointed out faced stiff competition from SZ who were operating frequency. The London market is give or take 100,000 pa. That's a ready made market for someone, a London route with an airline offering decent onward connectivity, thru ticketing etc would bring in many more punters, even just by making the domestic / Irish destinations available again/ available year round.
Will it happen, probably not.
Should it, yes !
BA LHR route ex NQY would open up the world and Europe to Cornwall and bring business and tourism to Cornwall.
Just my opinion, no matter how wrong I keep getting told I am.
cs