At least in Europe, fields like gender studies are rarely anyone's major, it's something people study on the side because of relevance to topics they're already interested or just curiosity.
It's useful stuff for if you end up in any job where for example you engage in discussions over policies or parts of society that relate to gender issues, so anything from NGO-work, politics, media, academia/research, social work, arts, marketing...
"What's the point of gender studies" is really like asking "what's the point of studying history" or "what's the point of studying the society". While obviously in a perfect world you wouldn't need a specific department for this topic, we don't live in a perfect world and a lot of this stuff has not been studied nearly enough in the past.
Over time hopefully departments of gender studies will make themselves redundant, but pretty sure USA isn't there yet.
EDIT: Now that I think of it, I can think of three people that I personally know who studied gender studies, and all have done very well in their lives. One is in IT somewhere, not sure where, probably unrelated to gender studies, but the second is a lawyer specializing in family law and children's rights more specifically, and she's quite influential in her field, "heavily involved in drafting new legislation in her field" kind of influential. The third majored in Asian studies and while she's not there now, she at one point very specifically got a job as a game designer / writer at Bioware because she was someone who could write for both an Asian and a Western audience (something western companies often struggle with), and her background in gender studies was also seen as a bonus because back then Bioware was still in the RPG business, and their games had an audience which really cared about for example that your characters BDSM-relationship to a bull-man was written with enough female gaze and understanding of consent
