No way. I don't think that'd be ethical as a mentor. I mean if they are NOT doing what they signed up for--which is to try and incorporate your insights/suggestions into their reviews and improve, then why bother?

I don't expect a student to do every thing I suggest and mostly, they don't. They very often still cut things a bit shorter than I'd have preferred, but if they're getting the majority of it down and truly making a very good effort, I'll pass them when they are ready, but only then. I mean I won't force someone to stay. I always give them the option, but I'll be honest and tell them that they're still not putting forth enough effort for me to be comfy graduating them. I don't want someone writing awful reviews after having ME as a mentor. If it was really bad and they wouldn't EVER make an effort, I'd simply do nothing or cancel. I would not pass someone who made little to no effort.