I think the idea of any ego state or alter or any aspect of ourselves having to "go" is a bad idea. Acceptance, firstly, is what is needed. Understanding that part of you and why you need or needed to be that way, have that aspect, is key to progressing and improving as a human being.
For alters who are developed to hear they have to "go" would only make them dig their heels in farther, or worse, disappear taking valuable information you may very well need to work through for healing.

There isn't anything inheritantly wrong with any aspect of yourself. Once you are a congruous person again, then you can begin to form yourself into who you want to be overall.

TC