I guess you're right. If there is no "market demand" why increase the production cost? But - I have no idea how much higher "bulk-price" for rosewood is (for Fender) compared to Pau Ferro, and how much it will increase the price of a guitar. Maybe they'll try out some model(s) to see if the market accept the price diff. Even though it might not have any benefits compared to PF, rosewood is more common known, have better looks (my opinion) and probably easier to "sell".