I would say their use/potential was realized late, seeing how they were discontinued while the full sized Nimravus lives on.
They've grown in popularity recently. They are more easily EDC'd and a little easier to use in finer "camp" style applications when compared to the full size. The full size, as I have observed, usually fills the camp knife. However, I don't believe it fills that role better than the nimcub.
Also, because of it's length, in some states of the United States of America, it can be carried and not considered a deadly weapon.