I believe that a child having a higher well being later can be partially a result of the intial attachments; however it may be the environmental factors as well as situations that may happen between childhood and adulthood that result in the higher or lower well being later on. For instance if a person, know on wood, is raped, their well being will be shaped drastically despite their initial attachment.
I agree individual events that are very life changing or have a great impact on how the person views the world can greatly influence their well being later in life. The initial attachment can only provide a foundation for the person to do well but it does not guarantee that the person will not be influenced by outside events.
