Im curious...

I think SE was exploring different methods of delivering expansions with the Abyssea & 3 mini expansions. What was the release year for each of the RoZ, CoP, Toau, & Wog?

If ARR only gains a niche and expects those players to hang around in a subscription model for ten years. How many expansions(major) would it take to equal the time taken to keep players invested as long as they were in XI. I ask because ARR is supposed to be a bit more on the casual side.