I have not tried to argue that anyone can become Albert Einstein or Mother Teresa, but I have tried to argue that we do not know what anyone’s future… - Carol S. Dweck

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I have not tried to argue that anyone can become Albert Einstein or Mother Teresa, but I have tried to argue that we do not know what anyone’s future potential is from their current behavior. We never know exactly what someone is capable of with the right support from the environment and with the right degree of personal motivation or commitment.
In addition, an incremental theory does not say that people will change. In many cases, it would be extremely foolish to believe that a person continuing in the same environment, without any psychological or educational help, will change. So an incremental theory does not predict that people left to themselves are likely to become better people over time, not at all. It simply says that people are capable of change.