Agreed. The trick isn't forcing Batman movies into production so we'll have a new one every three years on the dot. It's making sure that you have a director and screenwriter with a clear vision before green lighting it. For those of you who are talking about the failure of earlier comic book movies, I don't think that even applies. The reason those franchises failed is that they set a formula for the franchise. The first X-Men and Spider-Man movies basically became the blueprint for the two films that would follow, and by the third, the formula had just been run to death.
This new Batman is an entirely different animal. While TDK maintained the tone and background of the first story, it was a very different style of film. BB was an origin story framed in a character study. TDK was a tight, frantic crime thriller in the same vein as Heat or Ronin, and the third one should and would fit into its own stylistic niche, determined by where the character needs to go next. It has the potential to beat the franchise curse by making each entry in the franchise different from the last, a film in its own right while still being embedded in the history of the established universe. Hypothetically, the series could go on for years and years, and hopefully they'll keep from falling into the trap of numbering the movies. If Nolan isn't onboard, and they can find a script that really kicks ***, and a director that has powerful vision for the character, then they should go for it.