Yeah, I'm aware of the issues with implementation. It doesn't necessarily have to be required by the government.
Not sure why you're talking about the state prescribing morals. Ethics courses wouldn't do that; they would encourage people to think about morality, which is a powerful way of developing a moral compass. I don't see a problem with juniors or seniors learning about Robert Wolff; moral compasses should be as diverse as music preferences, and like i said before, thinking about morality rationally cultivates more considerate behavior in my experience. Obviously this is just my opinion and I could be completely wrong. I think you're probably right about freshmen being too immature. Obviously it isn't set in stone; juniors and seniors could probably handle it.
I'm taking an ethics course at the moment and it mostly revolves around understanding concepts proposed by Kant, Mill, and other philosophers. It has nothing to do with coercing people into certain moral frameworks.