The likelihood of doing that successfully goes up the more you know about the problems with the old thing and the more people who were involved with creating th

The likelihood of doing that successfully goes up the more you know about the problems with the old thing and the more people who were involved with creating the old thing are still around. Just firing everyone and starting over from scratch is never going to result in an improvement. Even if the problems were because the original team was just incompetent (which it rarely is), you aren't going to get a better team the next time because if you knew how to hire a competent team you wouldn't have hired an incompetent team the first time.