I can't make up my mind about the ending. I don't want to give it away, but as any of the reviews of the movie will tell you, it's not a happy ending. One of the things I liked about the book is the way that it's absolutely tragic despite the fact that nothing really happens, and that is somehow far more poignant than the actual tragedy that the text ends with. But then, maybe that's the point? I can't make up my mind.
I want to add that one reviewer, I can't remember who, made an important distinction concerning the novel - it's not about how the suburbs ruin people's lives. It's about people who blame the suburbs for the ruin of their lives. This, to me, is an absolutely crucial difference. If you take the first view, you end up like the characters, if you take the second, there's still some hope for you, maybe.