They would sell boatloads at ~$125.
How many beginner threads are there (no matter the camera brand) about which lens to get next...and the first recommendation is a fast 50?
How many Canon/Nikon crop owners have a 50/1.8?
Personally, if they made an L version, I don't think it would step on any other lens' toes. The FA43 and DA*55 are in a totally different league and price bracket. The DA40 is f/2.8 only. The DA35/2.4 is still a 35mm lens (I don't pay attention to "a xxmm lens is yymm in crop terms" because focal length = focal length. Discussing field of view is boring anyway...).
Make it a DA-L 50/1.7 WR for $150 and they would be on the gravy train, IMO