The problem is that coursera classes thin out dramatically as you reach the graduate (or even middle/upper undergraduate) level of whatever topic silo you are interested in. CS might be an exception, but the offerings in large swaths of chemistry and physics are extremely meager and I imagine that's the case in, say, biology, the humanities, etc.
Universities have precisely the opposite problem: professors love to teach high-level classes in their fields of interest but they don't particularly care for the intro-level classes.
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The problem is that coursera classes thin out dramatically as you reach the graduate (or even middle/upper undergraduate) level of whatever topic silo you are interested in. CS might be an exception, but the offerings in large swaths of chemistry and physics are extremely meager and I imagine that's the case in, say, biology, the humanities, etc.
Universities have precisely the opposite problem: professors love to teach high-level classes in their fields of interest but they don't particularly care for the intro-level classes.