Let me add my claim to it not giving enough credibility. I tried a construction close a few days ago for a short stretch of road that was posted as being closed for four days. It did immediately route me around my closure, but the next day tried to take me through. The road surface had been entirely ripped out so I know that not a single Wazer went through the construction (unless he/she was driving one of the tractors doing the rebuild). I'm not a Champ, but with over 2 mil edits, a level 5 editor ranking, and having held the gold waze mood for my state for over a year (finally lost it this week due to computer problems keeping me from editing,) I'd think it should give me a bit of credibility in making a report last more than 24 hours.
I think this tool has potential, a corresponding tool in the editor (level 3 or higher only?) for marking longer term (days not weeks or months) closures in the editor would be a good idea. Yes updates are frequent enough now, but it would be nice to be able to simply note a planned closure in the news or on a flashing sign, and be able to not only enter the planned closure but also pre-program an end date for the closure to lift, with a threshold over-ride if a certain number of wazers are tracked through the closure prior to the scheduled opening. (though maybe not the threshhold idea as I have seen evidence of construction workers running waze through construction zones.)
In app reporting for accidents, weather, impromptu construction and other short term closures lasting up to a day or two. In editor reporting for closures longer than what the app allows, but without requiring us to actually change the map (disconnecting segments), just allow us to mark the relevant segments as closed, and set an expiration time/date.
But I'm late to this discussion so that's my 2 cents, carry on.