Following my review of this one I got a note from the author. It said:
I'm Bill Condon. As explained to another reader, Katrina, the ending was based on an actual incident that happened to me. There is no magic bullet to cure very dark depression, so I wrote that open ending, which to me showed that there were hard times ahead, but if you kept on going and hoping, you had a chance.
Nice to hear from you, and I entirely understand your point of view.
It was truly a pleasure for me to get feedback from Bill on his perspective.