German Language SE has been discussing whether they should have only three close votes instead of five to close questions. Stack Overflow lowered the close/reopen vote threshold from 5 to 3 in December 2019.
I am bringing this up because on sites where few people participate in moderation tasks, close/reopen votes can expire before they reach the threshold of five. (For example, the question To what extent are the stylistic devices in Death of a Salesman and The Stranger similar? reached three reopen votes that all aged away. Similarly, the question Modernism vs Realism currently has three close votes which might also expire.)
This situation may have been exacerbated by the fact that two users who participated a lot in moderation tasks were elected moderators a few weeks ago, which means that we need more other users with non-binding votes to look at the review queues. (Close and reopen votes by moderators are binding, which is why moderators here usually wait until there are four votes in the queue, so their own vote has the same weight as a non-moderator's vote.)
You can gain moderation badges by participating in the review queues. But if that incentive is insufficient, what can be done to improve the situation? How would people feel about lowering the close/reopen vote threshold from five to three?
Update: This question has also been discussed on Japanese Language SE, where CM Catija shared some important information in an answer (emphasis added):
The number has to be the same for every close reason but we can change the number required to close a question to 3 or 1. We've run a couple of tests on other sites and are willing to test it on others. If you'd like to run a test here, have a discussion about it and then have one of your moderators ping me once you've made a decision.
PS: Personally, I prefer more review queue participation. We don't get inundated with off-topic questions so checking the queues really doesn't take much time.