I think it's a 안전한, 안전 bet that they'll last a pretty good while. The writers have been steadily building this relationship up over the past two seasons (or even since season one, based on what some of the people behind the scenes have said). They wouldn't have invested so much time in them if they were just going to break them up in a few episodes.
i wish and based on this: "And then after that, we have probably our most monumental, life-changing event in the 초 half of the season. Not only does the event in the 100th episode change everything, but they’re changed forever again in episode 17.” — Joshua Safran, The Hollywood Reporter i think they will....