All of them! The focus should be on career flexibility, not pigeonholing oneself into a single career that can lose viability in an instant. There is a saying:

All of them! The focus should be on career flexibility, not pigeonholing oneself into a single career that can lose viability in an instant. There is a saying: Don't put all of your eggs in one basket. It is especially pertinent when it comes to jobs. Things can change very quickly, as many people have learned over the years. When there is a concerted effort to push people towards a certain career, as we are seeing with software engineers right now, one should be especially leery about the future. But at the same time one may as well capitalize on these careers while they are viable. Flexibility allows that and readys one to move into the next big thing when the shift comes.