I have to disagree on completely shutting them out under the first proposal. For starters you're asking for drastic changes to be made because of a sporadic nuisance that only infuriates a few. To boot, the URs aren't gone forever, just click on "show closed" in the layers menu and you can continue to make comments on the UR.... However the others involved in the conversation need to select that button as well in order to reply.
To further play devils advocate;
1: There are some areas off the beaten path that only have level one editors monitoring anything on a regular basis, and because of the recently increased level limits, and the lower proportion of roads to edit, it will take them longer to level up to 2/3/4. Also, considering the higher proportion of rural areas versus suburban, it will make their lives more tedious always PMing higher level editors to close out the UR. This is because these areas don't have AMs and thus they'll need to take it up with their RCs, and the RCs already have a busy enough job.
2: Not all L3/4/5 editors are created equal. I've seen no less than 100 UR's that had L3/4/5 editors simply never close out the UR. They could be stated as solved, had no conversation for over 45 days, you name it. They're okay to close, but never closed. Let the L1's come in and take care of the grunt work and earn some points.
3: Your AM needs to take a more active role with this and you should be keeping tabs of names and sending those to them with a nice tidy report, they're the manager of the area, it's their call.
That aside, there are better options than just shutting them out.
Yessir. I proposed a similar idea here
. (I was under the impression at the time that AMs have the ability to reopen closed URs.)
For example if this is true, then expand that capability to L3/4 editors.
Add a lock button similar to the lock on a road, where you someone can lock a comment from being closed, or have it auto lock for the highest responder.
Add exclusion zones around major cities. These could be drawn by the RCs and the minimum level should correspond to the size of the metropolitan area. New York City for example could be a minimum of 3/4 and smaller cities like Memphis can be 2/3.
I understand the annoyance of lower level editors and fix their mistakes all the time, but there are better ways to approach this than just putting them at the kids table.