Just because I have a hammer doesn't mean everything is a nail to be pounded on. Similarly, just because Dramatica is a story creation and analysis tool doesn't mean that it's appropriate for developing every story. The only safeguard against producing homogenous stuff is to make sure that a writer's world is filled with a variety of experiences, interests, and means of expression. These software tools should be a part of that variety. It's best to know the rules before you start breaking them.
Innovation generally comes from breaking the rules.
Dramatica is designed to show a writer the rules in such a way that it makes it easier to know how and where to break the rules. But let's be realistic here. A writer doesn't NEED these software tools, or even a computer. She doesn't even need paper and pencil. All she needs is an audience.