Precisely. I've read the whole thing through who knows -x20? over 30 years, the movie, if bad, will just glance off my mind, like bad calendar art, or Bakshi's awful film, or that cartoon with the Orcs singing "Where there's a whip, there's a way!" Indeed, I am not all that concerned about (possible) plot alterations or character switches/amalgamations (I know it was Glorfindel at the Ford, showing it to be Arwen won't change that). What I look forward to is a chance to see vivid images of (one possible interpretation of) a great book.

It's a shame though that we are such a visual image oriented culture nowadays, that movies, in many minds, define a story more than books (admittedly, novelizations are derivitive of the original film in many cases.) Recently, I was in a "Space Themed Restaraunt" with all sorts of names on the wall: John Glenn, Neil Armstrong, Yuri Gagarin AND Obi Wan Kenobi and James T. Kirk and Ripley. I asked the owner where Hari Seldon and Lazarus Long were. A shrug, as if to say who? who reads old books? Millions of us.
JRRT defines Middle Earth, not Peter Jackson. Let's all relax.