Seeing as most users already stated all that I could possibly say, I do admit, like them, that this is indeed a good factor and could be a nice touch when it comes to groups altogether. Why individuals who fall inactive don't delete their own groups is beyond me, however the reasoning can be various depending on each member. I'm merely intrigued and a bit relieved that, like Ms. Linger has stated, the staff has got it covered for the most part.
Good idea, all in all.