Seems to be primarily sales/demand driven at FR. I too have a retired model from the Hemisphere/Heritage Glen sisters - wouldn't trade it at all! However, we were told by FR many of the couples models were being discontinued/reconfigured because of lack of sales. I think, personally, that was more because few dealers put those models on their lots, at least here in the NE. Conversely, we had a 2008 Shamrock 21SS (sister line to the Roo) and that model had been in production several years and remains in production today - hot seller!