I don't. E/D concourse is pretty well filled up these days between Delta, American, Hawaiian, Mexicana Continental, United, Skywest, Air Canada Jazz, Lufthansa, and Northwest international to Tokyo.
C concourse is the only one I see needing the space filled. But even then, there are only a few gates that go un-used during the day. And, with the rumors of AirTran, and JetBlue interested in PDX
....that could be a thing of the past.
As for the new runway...
Horizon Air ops could be moved easy. I'll bet if the city built a newer, larger maintinence facility for QX
, they wouldn't say no. as for the Air National Guard. Again, a newer ramp area of equal or greater area wouldn't be turned down I bet. Facilities can be moved. The largest hurdle in the new runway, is getting around the golf course. The new runway isn't the biggest issue, however. They have other areas of the airport they could build a new terminal at. A new runway at PDX
isn't a huge need, as I see it, however. I do agree that the A/B concourses need to be renovated. I think Horizon could use a new facility for they're operations. the A concourse they're in now feels like a dungeon at times.