Nicolas Cage is surprised that National Treasure 3 is still not moving forward. The first National Treasure film, released in 2004, remains one of Cage's most popular works. The success of the action-adventure heist movie led to a sequel, National Treasure: Book of Secrets, that was released in 2007. Fifteen years later, the franchise expanded further with the Disney+ television series National Treasure: Edge of History, although it was canceled after one season. Throughout this time, there has been discussion and speculation about whether National Treasure 3 will ever happen.

https://screenrant.com/national-treasure-3-development-nicolas-cage-response/