Coming to this late - sorry.
I've led creative writing classes and mentored writers at all levels, from Y2 kids up to adults. It really depends what you want to get out of it. You can't "put" talent there, but you can help people to find their voice and make the most of the talent they do have.
With young people and adults, you can keep them informed about opportunities for competitions, magazine writing, etc., and show them how to put together a proposal for an agent.
Some parallels:
You can teach someone to play the violin. Nobody denies this. But people don't go to violin classes expecting to come out after two years playing like Nigel Kennedy.
You can teach people to draw and paint, unless they have absolutely no talent for it. But again, they wouldn't expect to do an evening class for a few years and exhibit in the Tate.
And yet people often seem to think creative writing classes should be some kind of ticket to writing fame and fortune - when even moderately successful writers don't have fame and fortune. Earning a living from writing alone is something very few people do.
For that reason, I bristle a little at the somewhat chippy tone of the OP!