Sorry, I must not have been clear. I'm not asking about RifE for Civ5.
I'm asking about the plans of RifE for Civ4. Clearly, at some point the desire of the community to have an ongoing mod in Civ4 will wane. And, I would think that it would be desired to have RifE somewhat in a state of "completion." So, at some point, new features won't be developed any longer, and hopefully there will be some effort to fix any remaining bugs, polish up the civilopedia, that sort of thing.