Parents should motivate their children to use their utmost human potential. However, I strongly contend that parents should never plan their children's future. Many people are in careers/jobs they hate because the career/job was not of their choosing but their parents. Also, many young people fail college and courses because their parents choose the college and courses instead of letting the young people make the decision.
Even if the young person is initially unsuccessful regarding his/her major, at least, it is his/her decision. If the major was a mistake, there are ways that the young person could work around it. Many people who have their parents' dictate their future and life are VERY UNHAPPY people. They do not own their lives but are living lives to please their parents. That is no good at all.
The best thing that a parent can do is to teach their children to become self-motivated. Children who are self-motivated have the wherewithal to success in any task and/or under adversity. Parents who make decisions for their children, particularly their future, will have very unhappy children who will one day HATE them for robbing them of their individual lives and independence. Such parents can be classified as quite abusive and authoritarian.