The idea that the resolution is somehow separate from the nature of the crisis is misunderstanding how TV episodes are assembled. What happens is that the writing staff "breaks" the story -- plots out an outline of the entire episode, or in this case the entire 6-part arc -- as a group, working out the whole story from beginning to end, before anything actually goes to script. The idea that the "wrote themselves into a corner" is based on the assumption that they started writing before they knew where they were going, but that's not how it works. They would've settled on this outcome to the arc fairly early in the process, and then it would've been a matter of building up to that desired outcome. If they'd wanted a different climax, then the story leading up to it would've been different.