User blog comment:Xhatefate/DxD Updates~/@comment-27083298-20170102160623/@comment-9595671-20170103084753

Though at the same time, if the sales for this season increase, then the reverse happens. A better chance for a 5th season and less of a reason to shelve it.

So in other words, Season 4's pretty close to the line where your a make it or break it, but can't actually be placed on it till we see what happens.