And if you did, what does that do to the form? Does it disappear from the widget? Does it not appear in the drop down when presented with a list of forms to insert in the drop down when editing a post/page? What happens to a post that has a shortcode for a form that is now inactive?
Also, when viewing "inactive" forms:
you get a message of "You don't have any forms. Let's go create one!" - which is not accurate. I don't have any inactive forms, but I have lots of forms.
What is inactive supposed to be used for?