When they've made 24 Tarzan films at the same studio, let me know. The property has drifted around from studio to studio, while the Bond brand, even through the awful films of the 70's kept plugging right along.

Here's an all-time franchise boxoffice list, adjusted for modernity, which is what this debate is about:

http://www.boxofficemojo.com/franchises/?view=Franchise&sort=sumgross&order=DESC