I have a unit with a discontinued floor plan, too. I think it went bye-bye because it is not an Open Floor Plan. Our 3500RL has a rear living room separated from the kitchen/dining area with French Doors. But, we like the separate room kind of thing because it enables the living room to be a separate private bedroom for guests and it works for my daughter and her husband and our grandson.
I guess we're planning to keep this for a while so we can't be too concerned about the floor plan going away.
I'm sure the floor plan will cycle around again.