He has no time for this, that's why he posted it as an idea with a question and that's why the community have to gather and point out some candidates for the task. People who are really into what is going on in the forum and want to do it.
One thing I've learned here in the forum, if you want some nice things to happen, you have to work for it, they are not just dropped by theymos as gift, we as a community have to do something to make it happen. We can't just wait and say "Theymos do this, theymos do that". His name maybe sounds like a god's one but he is a human as we are (except for LoyceV, we all know he is an AI) and seems like one really busy human being.
If we don't gather, find people who want to participate and finally present them to him for approval, it won't happen. It is exactly the same situation with EpochTalk. If we want it, we have to test it first and report the bugs, and when all is done, then we will get it.
While I agree with you that things here usually happen, when someone else makes the effort to improvise things around here, I feel like regarding this topic, people can't do much. This place will become a portfolio submitting messhole, if people were to work for anything(be it their youtube "career", or teaching skills for udemy etc).
If bitcointalk is to have a youtube channel ever, the admins should at least give out some info on how they want the whole thing to be executed, and also privately start messaging users whom the admins trust, and get things rolling. Otherwise, I am afraid nothing much is going to happen

At least if not a youtube channel, and a udemy course, the new forum should have sub-forums where only certain people are allowed to post/review the content, and those sub forums could have all sorts of courses, and videos. That'd be pretty dope, if you ask me.