User blog comment:GregoriusThe2nd/How Will It End?/@comment-5433366-20141209025127

The best way for the series to have ended would be with the tablets. Demon tablet, send all demons to Hell, angel tablet, send all angels to Heaven and lock them there, and Monster tablet, which kills all monster DNA existing on the planet. Of course, there would be lots of conflict, such as Cas having to deal with being locked in Heaven with all the angels (though the whole 'no Grace' thing going on, that would make an interesting concept too). Best way to end the series, but they already blew that, though I always doubted they'd go that route due to it being too specific.