Harmless speculation is all, nothing more. I agree that fairly sizeable and important chunks were missed from LotR, but the Belgariad books are smaller, and if a movie were to be made - which in all likelyhood won't happen - then there's no reason why there couldn't be one film per book, as with the Harry Potter books.
Not that we expect that anything like that will happen, but it's fun to dream every once in a while
