For the last two weeks the CV queue doesn't seem to decrease. It is more like stagnant between 47-49k questions (I haven't seen it fall below 47k, as of writing it is around 48.5k).
Wouldn't it be better if the limit would be relaxed (to for example 60, with the 50 close vote limit still in place), BUT reviewers wouldn't get review points after the first 40 review (so robo-reviewers would have no real reason to continue reviewing apart from not noticing that they are past this limit).
This could be also improved that only the first 20 reviews would count for the badges (like for other queues), but if someone wants to they can continue reviewing until the second, more relaxed limit (like 40 or 60). This would also discourage robo-reviewers in the close vote queue a bit (but encourage others to do more reviewing, and empty the queue faster)