Seeing that there are add-ons that can convert V4's entire morphs and clothing across the entire generation 5-7 character lineup means that she won't leave completely as there is an interest still there, but at some point people will move on as DAZ has clearly moved on from making V4 content, it is up to V4 PAs to carry on, and if not, you can always have V4's morphs and clothing live on through genesis 1-2.