As obsessive as I can get about certain things, the reality is that I can’t be steward of this metaproject forever, and so with V6 I fully intend to set the prequels down and just let whoever wishes to take up the craft going forward cull whatever they wish from them. They’ll be my ultimates, of course, but there’ll never be an end of the line.
Even if IX ends up requiring me to go back again, say if the plot crucially involves midichlorians or something, I’d probably just reckon those as V6.1.