It's nobody's place to suggest that anyone should "give up",
On the whole, and in the context in which we're discussing this, I would entirely agree, 3 Point. But one type of student does worry me. This is not the slow learner, far from it. It's the person with the wrong attitude, the know-it-all, the one who won't listen, who's dangerously over-confident. Such people can change, and often do....particularly once they try to hover an R22. But if they don't appear to change, I might be inclined to suggest they give up flying...I'd certainly think it anyway.
But the slow learner with the right attitude. No problem at all, except possibly for their bank manager!