I honestly don't see Bristols owners spending a lot of money for something not guarenteed. Etihad are in retreat and Emirates even with the 787 10 might not have the right aircraft not to mention that BRS has no cargo facilities. It's also quite possible that both airlines see Bristol as being covered by their Heathrow flights.
As for the airlines mentioned Turkish could be a possibility but they might also see Bristol as being covered by their Heathrow flights. WOW has been and gone and Finnair would be interesting to see. Swiss like Turkish could also be a possibility in the future.
As for flyBMI i think it's anyone's guess as to what'll happen to them!