I believe it needs a bit of a push. At this point in time, it's certainly up to the discretion of both companies to enter into an interline agreement. I agree with Joe's comments that, at the end of the day, it opens up the playing field. It certainly would allow the travelling public to more or less see the world on one ticket rather than on multiple travel itineraries with different airlines. If both players came to the party, we would see a combination of the fare, which would be more pleasing to the passengers as well.
That's what I'd suggest.