Careful what you wish for, if they stay with more B788s then regional UK flying will be downsized, the B737MAX is also not ideal. The reason there's been an upsurge in B757s to the US is they're fully depreciated assets working hard at the end of their lives. Not sure BFS/NCL would see much ROI on a new capital intensive fleet of shiny Boeings.
Given Qatar and Etihad are killing each other over scraps in EDI while Emirates remains with the spoils at GLA, I think this might be er.....wrong.