They should major in the area of business they find the most interesting. Any business degree, regardless of major, is just a starting foundation for a career. The real expertise is learned on the job not in school. I tell people to focus on what you are good at. There is always a need for people good at what they do.
As long as money is an important part of our world there will be a need for people with business acumen, knowledge of finance, accounting, marketing, etc. The tools they use and exact nature of their jobs may change but as long as they have a good foundation and ability to adapt they will be fine.