I don’t believe that Scapple will lose many users as a stand-alone program. Let’s be honest: if I have to create a complicated or extensive and nested mind map, I won’t reach for Scapple - you should be that honest.
I’m probably not following what you mean, but the point of Scapple is that it is not a tool for making these kinds of things. There are already good tools for that, if this is what you need. You might even be able to start with Scapple and end with one of them, if that is how you prefer to do things. We are quite honest about that, everywhere. It is a simple freeform text editing tool for quickly capturing thoughts, no making complex diagrams.
As it has been said in this thread before, and in the knowledge base, and in many other threads: we have no plans to combine these two completely different programs together into one.