They need to tempt users to new lenses, not introduce compatibility issues.
They would tempt me with a nice AF portrait lens. Let's see:
FA 77 - greta lens, but too short focal length
FA 85 - too expensive, a little bit short, great for indoor only
FA 100/2.8 macro - right focal length, great lens expensive, and hey, it's a macro
FA 100/3.5 macro - right focal length, nice price, a little slow, again a macro
FA 135/2.8 - nice focal length, would be great except it's quite soft.
So where's that killer portrait lens ? I was looking hard and my best bet was the 100/2.8 macro.
cheers, caveman
