No, wouldn't like that in the slightest - and not because of the big old green flair either; but because unlike in places such as /badhistory/ it wouldn't actively encourage other topics.

The topic of moratoriums have been covered extensively and have been shot down every time, and here's why: Banning questions for any amount of time probably won't increase the asking of questions on other topics. Sorry, but it won't. Lowering the rate of questions that have a high visibility will simply lower the rate of questions overall: questions about Qing China or Sanskrit linguistics won't magically increase as a result of this. What you'd have instead is an even less active sub for a day, and no one wants that.

Edit: To any naysayers, I encourage you to practice new-fu; as you can see, there's plenty of interesting questions on a range of subjects. Sadly, most of those will go unanswered - and this has literally nothing to do with the plethora of experts who are able to answer MilHis questions. Preventing us from doing our job won't make this situation any better, but just add to the tumbleweeds in /new in general.

As someone who subscribed to /r/askhistorians roughly 1 month ago, I always enjoy reading the WW2 and Rome questions here and have yet to see any repeats. It's a major part of history and I feel like blocking people from asking about what they're curious about defeats the purpose of the sub

Like Mr. Nerf said, it won't be happening, and if you feel that certain topics are getting too much attention, the best way to combat this is to check the new queue and help give upvote boosts early on, when they matter the most!

We try to encourage people to ask new and interesting questions - You should ask a question about "Othering!" - but we don't feel that the trade off in going the other way and making an entire topic of limits for a time is worth it.

I'd prefer a demon cast a spell on the entire population of the anglophone world and make them all suddenly much less interested in the intricate details of various war machines and fighter jets, and much more interested in social and cultural history. But since that's never going to happen, I'd rather the masses get a dose of academic history in their WWII discussions here than see those same conversations take place in the terrible wilderness that is /r/askhistory.