Do you think Chris McCandless went into the wild to try and agriculturize and survive, or did he go to perish and face his death?
McCandless, like many before him, was passionate about life but unprepared to see his limitations to sustain it. He may not have intended to die, but he saw that it was a very real possibility-
This is the last you shall hear from me, Wayne...If this adventure proves fatal and you don't ever hear from me again I want you to know you're a great man. I now walk into the wild.
I think it's fairly obvious that Chris' journey to Alaska was to be the fulfillment of his two years of wanderings. I'm sure this was not a suicidal journey, but one that turned bad for him, resulting in his unexpected death. I feel that Chris would probably have made Alaska his final stop before returning to the U.S. Whether he would have contacted his family, settled down and gotten a job, or started a new journey is uncertain, but he was so full of life that he most certainly did not go to Alaska--his great goal--just to die.
I think that Chris was depressed and frustrated. I am not sure he was exactly suicidal. I think that he was committed to trying to survive on his own. There is something romantic about the notion of living off the land, depending on no one.