Nuhdeen thought she could easily launch a solo career post-''Out Of Control'', now look at how that went. Now, right before the comeback, she's clinging to them like they're some kind of demigod.
What goes around, comes back around...
It's been a long time since they released anything so nothing is guaranteed. I'd imagine they'll be testing the water so to speak, if the comeback single is a success then I think they'll stay around for more than a farewell tour and GH collection.