You have to figure that a MoS sequel would have some sort of colorful antagonist, hopefully played by a strong actor. In this case, the character in question happens to be Batman rather than a villain.
Why? The longest "rest" that James Bond has ever been given is six years, and that delay only happened because of sales and mergers and lawsuits behind the scenes. Other than that, the only gaps longer than three years have happened because of the studio's financial troubles. They don't take a "rest" between actors or incarnations, they just try to keep going forward as steadily as possible.
The Bond series has proven to be more the exception than the rule.