I really did enjoy the movie but

I didn't mind because I never got the sense that the escape plan was actually what mattered. One of the criticisms commonly made of this movie is that it's just too long to justify how little actually happens in terms of plot, but I think that sort of misses the point. It's not a movie about a series of events so much as it is about the experience of two people exploring a new side of themselves with each other, and what really mattered was not whether they could escape and start a new life on the outside, but whether they were willing to give up everything they knew and jump into the unknown to hold onto what they had found. So when Silas sits next to Nia on the train and takes her hand, you're getting the answer to the question the movie is really asking.

But to your point, they would certainly die unless found and taken in by other people living in that place. The Collective is a nanny state in nearly every sense of the word. Virtually all grunt work is automated so that all of the citizens can focus on scientific pursuits. I'm sure neither Silas nor Nia would have any idea how to start a fire, make clothing or shelter, hunt, or cultivate crops.

My thoughts exactly. ..they are clearly not equipped for life outside of their sterile environment. Having said that, as a viewer, you're willing Silas to re-ignite his love for her. I think you have to remember how controlling The Collective are, especially with propoganda style information. They have wrongly described emotions as a disease and Silas's own description of those who inhabit The Penninsula is deliberately derogatory. Therefore it's a distinct possibility that there is a viable community out there to take them in.

That's my chosen interpretation because I don't think Doremus would create such a beautiful love story for them to just get off the train and die.

I too enjoyed this film and I love Nicholas and Kristen in it. Their acting is very convincing.