I like the idea of a weekly megathread type thing.
I agree that the daily threads don't seem well suited to the number of people on here. One of the good things about here is that conversations can carry on across multiple days, unlike reddit was where stuff got buried very quickly.
But having a daily thing sorta sends the message that that thread is done after that day. Sometimes I'll read something from an old daily and think of replying, but then think "nah its moved on" because of this.