I think the GC will go ahead...its prety much a done deal as they know it'll survive. Western Sydney is a different kettle of fish as it s doesn't have all those ex-pat vic's living there. They'll really have to compete for the hearts and minds of the immigrants in that area to get a strong following.
As for Port, as I said all the things they have drag out is what they have said about the dee's, ie low auskick numbers. In the long run I think they will be stuffed as from what I have read, unless you are born into a PA family you hate them. They needed another generic team like the crows, dockers and eagles to get a strong and growing base.