I think your all misunderstanding the Kenny McCormick concept. Even Cthulu couldn't stop him, even Satan couldn't, Heaven couldn't keep him. Not even The Doctor or Goku have as many lives OR a more convenient method of coming back to life. Kenny dies, everyone and everything dies. Goku has no ability to regain 7 dragon balls or whatever the hell brings him back, and The Doctor is essentially evaporated or whatever permanently keeps him down. Kenny wakes up the next day, to basically nothing.