I think Gulf Air is considering everything. Lacking though, is a timely decision, which gets worse as other airlines announce large purchases of these new planes (meaning that any new metal (or plastic) will take even longer to show up on the apron). I've seen a Boeing poster with a picture of a Boeing 787 in the GF livery-- looks nice and without having all the information, facts and data, I personally think the 787 would make a good fit to the fleet.
Hopefully with the new leadership on property, and what seems to be renewed dedication from Government to make Gulf Air work, some sort of decision will be announced soon.
In the meantime, it is my hope that Mr. Dose and his team will push some characteristic Swiss precision and standards into things that are most readily apparent to our passengers, such as the interiors of our existing fleet (they will be here for years still) and on-time performance.