I love Steemit, but 30 days was bad enough now you want to close comments after 7?
Maybe you could get away with it if you had a chat, but you don't and neither does busy.org because it's not in chain and it keeps failing on me.
Comments are the way to keep things alive, it's why people will be creating most accounts, to be able to leave a comment telling someone to fuck off. I think they should be able to do that after 7 days, hell, I think they should be able to do that a year into the publication.
I tried justifying this by telling others closing the comments after 30 days could encourage the user to keep making posts to always have a comment thread open, but I can't make that case anymore, not with 7 days, it feels forced.