If I may be able to conjure up conspiracy theories of my own,
then I will attempt to hypothesis how National Treasure came about
to debut on the big screen, based on opportunities which presented
itself at the right time. First, the popularity of Dan Brown's
controversial The Da Vinci Code, which was made into a movie of its
own, but took a tad too long in doing so. Topping the bestseller
charts around the world, it made Hollywood execs sit up and realize
that wild goose chases and solving riddles and clues do make an
interesting, workable formula. Coupled by the fact that the Indiana
Jones trilogy (at the time) probably will not have another sequel
see the light of day, then the onus is on crafting a tale based on
controversies, with Indy Jones tendencies, and chances are a new
winner will be born.
Continues at
http://anutshellreview.blogspot.com/2007/12/national-treasure-book-of-secrets.html