Now that you mention it, I could see a decent movie being made of Elantris, provided proper care is taken. And I remember seeing somewhere that Brandon thinks that Warbreaker would make a good movie, as the magic on Nalthis is very visual in nature. Those two books are self contained enough that it is possible to do them justice in a 3 hour movie. I just don't see it going as well for Mistborn or Stormlight, which feel like much broader scope stories (and are also much longer than the other two mentioned). I also am just partial to TV series over movies as a media. But I do agree with you that if your points are met, then we will probably get a decent product, if not a great one.