I'd have thought BRS would be pretty much a given if Emirates change some orders into the 789. The 78J might be just that little bit short on performance, but don't quote me on that, I may be wrong. I understand parking is probably the main issue.
Has a 777 ever been to Bristol? You could get a 777 300ER out of Bristol to Dubai with relative ease, but (again I may be mistaken) I understand that it might just be too big for manoeuvring on the ground at BRS.