Technically I believe if you have 5 of the 9 symptoms you a "considered" borderline - If you eliminate one then technically you are not "considered" borderline.

My personal opinion is that it is manageable and with time new coping strageties could move you to a less borderline place. My issue is always when stress comes up I result to the unhealthy ways of BPD. So I guess that is the true test - being able to reactive differently then in the past.