I love everything I've seen on Crash Course, in all its incarnations.
If there's one thing I'd like to put on the table, it would be BIOGRAPHIES. I know, in every episode, no matter the topic, you only have about 12 minutes to get as much information out as you can, as interesting as you can. Because of this, you're unable to talk about certain historical figures as developed human beings. Which is fine when you're trying to talk about a certain era or science, that's just getting the facts out. But we're all people, and I think it would be interesting to put a series together where the politicians, generals, scientists, artists, writers, and others who created this world are presented, dissected, discussed, and given perspective.
Such videos would be able to overlap what you've already created, and by doing so it would create more depth in the learning experience. For example, I was just re-watching your lesson on Conservatism. It would be great if, after I watched that, I'd be able to pull up a video you made on Barry Goldwater, how his pre-political life molded his views and helped create modern conservatism.
I'm sure we could just go elsewhere on YouTube to find this exact thing, but I am a fan of this channel, and I'm accustomed to John Green's point of view.