Dang, I missed his response in that thread. Theymos posts so infrequently that if you blink you can miss his posts, and it's not like they're unimportant.
A lot of the suggestions I've seen are fixes for relatively minor issues, but the major ones and the ones I wish he'd really consider have to do with the shitposting situation. I agree with him that even small changes can have huge (and probably unintended/unexpected) effects, but things like adding more moderators ought to be a no-brainer. Things like adding a merit requirement to rank up to Jr. Member would at least be a good experiment to see what happens, and it isn't like that kind of decision would have to be set in stone. Hell, Theymos could do away with the merit system if he thought it wasn't working and there would be nothing any of us could do about it. There would be no shame in doing so, either.
And yet it seems like most of the community suggestions aren't priority for him. His priority is apparently starting up a youtube channel for whatever reason. I don't actually think that's a horrible idea, but it just shows you how different he views the state of this forum. There are a number of members here who would probably suggest that he try to fix some of the glaring issues with his limited time instead of doing the youtube thing.
The other thing I have a concern with is his reluctance to delegate any of the major responsibilities, account recovery being one of the obvious ones. Vod has suggested at least once that there could be volunteers for that job, but as far as I know that suggestion fell upon deaf ears (or I could have missed the reply). In any case, there are certainly people here willing to help with things and I don't think they're trying to usurp Theymos's power here.