They will probably phase them out depending on the performance of the slx the casitas is an awesome reel but why would you spend 100 bucks on a graphite reel when you can get a solid aluminum frame from shimanos competition diawa ,the fuego, this is where the SLX comes in to take that 100$ market. Shimano has always been very cheapy on there lower end reels anything under the citica was always a good reel but kinda chinky they gave a small taste of their Engineering this is done especially with their spinning reels. Well this is where the SLX comes into the mix finally offering an aluminum frame reel at the 100$ price point.