My thoughts on this post are negative, but complicated. Let's break this person's positions down point by point, though not necessarily in chronological order.
1. There are too many people out there with useless degrees that the economy cannot handle: I agree, if you take "useless" to mean that the degrees are useless to them on a personal quality of life level, but that is not the fault of the students themselves or of the academy. It's the result of a larger economic problem where even education--vaunted as the great equalizer--cannot give a poorer person a leg up.
2. Most STEM degrees are useless: Unless you mean "useless" in the sense that the degree is doing little to improve one's economic standing, I agree. If you mean "useless" in the sense that the degree has no function to benefit society whatsoever, I couldn't disagree more. The more people enter STEM the better. I can't fault people for seeking scientific literacy.
3. The SJW problem is the result of numerous useless degrees: Let's break it down. Despite the outsized attention it gets, gender studies degrees only cover a small fraction of college grads. And I'll readily agree that gender studies has become one massive irrational, unscientific, self-referential circlejerk and thus comparatively "useless" in a benefit to society sense. So the "useless" degrees you speak of aren't exactly particularly numerous. It's much more likely that le SJW menace comes from people taking this already flawed scholarship and, in one massive game of telephone, adding steadily more and more unhinged ideas to their orthodoxy. Tl;dr: call it a disagree from me.
4. People shouldn't get degrees that won't benefit them economically in the long run: Pragmatically speaking in the current economy I agree, but ideally in a post-scarcity world people should be able to pursue subjects that interest them. Even gender studies, or theology, or memes, or the canonical example of underwater basket weaving. So I disagree.
5. Therefore we should enact an enforced scarcity of degrees: Very much disagree. We should make it easier for people without access to tertiary education to go to college (especially by reducing the massive cost of education), and we should also recognize that college isn't right for everyone and not treat it as a necessity when hiring even low-skilled workers.
