Is it too late for Spongebob?
I'd say that Harry Potter wouldn't be as large of competition as Frozen would be. Frozen and Spongebob are both based on beloved a children movie/show (although IMO spongebob was great even for adults). I don't think many potter fans would be deciding between Spongebob and Potter, but I can imagine lots of families deciding between Frozen or Spongebob.