Extraordinarily short sighted.
What happens if Emirates gets their wet dream and starts JFK to LHR service? Your place then decides to code share on that route. Wouldn't it be better if you guys grew internally, getting wide-bodies to fly than having ALL of it outsourced? Yes, I know they do give you guys some domestic feed, but unlike the Star Alliance or Sky Team where there is a coordination on who flies what internationally to allow for efficiencies that trickles down to the pilots at Delta and United. You guys get none of the benefits of having a wide body on your pay scale.
Also, you guys are benefiting from a business model (the subsidies Emirates gets from the government over there) that isn't fair to the current Open Skies agreement.