I don't think they "got bored" so much as OCW fulfilled its limited mandate modulo gaps like I mentioned, which require cooperation from the departments in ques

I don't think they "got bored" so much as OCW fulfilled its limited mandate modulo gaps like I mentioned, which require cooperation from the departments in question, which they implied might be the cause when I emailed them (it was a form letter so who knows, but at least the chemistry department isn't swimming in money for this sort of thing, especially with all the service courses they have to teach, with biochemistry being a joint class with the biology department). And of course the significant albeit limited success of OCW was part of the motivation to create edX.