The to the point? - there are other pilots that can be put in there and one of those sadly could take it away from "Pan Am."
I just tell people unless you see any of the stars taking on other roles for a more permanent time... it has a shot.
(And yes I think "GCB" is trashy - even "DH" is classier, such as taking the one storyline with the one woman wanting to kill herself like the narrator did on a very serious note. That was such a powerful scene for such a show, and Williams showed a side I hadn't seen before there).