As the question is posed, it's not clear to me if the feature is in a product that customers are using, or if this is a feature that just didn't work out and ne

As the question is posed, it's not clear to me if the feature is in a product that customers are using, or if this is a feature that just didn't work out and never was in a distributed product. The two are quite different. Killing a feature customers are actually using can create problems. But in some cases not killing it enforces the wrong architecture on the program.