Could happen eventually, once DU get more 787's, would have thought they could fill a 2x weekly flight from LGW and/or OSL once you include the connecting traffic from Europe. But it would probably be quite a hard route to make money on when you consider the sector length.
Still I'd say the most likely expansion for DU from LGW in the near term would be the addition of OAK and BKK along with some further frequency increases of the existing routes, assuming they continue to perform well.