This is maybe an unpopular opinion I don't know, but if it is, then please don't kill me! So, here goes, I think that in the series finale of MLP FIM, the princesses and discord should've not only turn the mean three to stone, they should've used a bazooka from the equestrian military to blast the same stone prison that houses the mean three to smithereens. And also, they should've ordered Pinkie Pie to create a even more powerful party cannon that's so powerful, it blasts stuff into space, put Grogar's bell into it, and see the bell go bye-bye, so that way, both the mean three and Grogar's bell won't cause anymore damage.
I know I know, then the fans will get mad that they killed a child that was trapped in stone along with the mean three and that if Grogar's bell gets blasted to space that it'll fall on another planet, but at least that way, Equestria will be safe.