I'm in agreement with a couple of the posts above.
Sure, I have a 3" J-Magnum frame Model 60 and it's a great conceal carry revolver, but it's not one I can take out and put a couple hundred rounds through in a session, without wearing out prematurely, and without my hand hurting.
My 3" Model 13 is superb shooting pistol that will tolerate high round counts from frequent practice and yet it isn't too large or heavy to conceal comfortably and effectively.
But it is blued and in the summer in NC, it needs oiled every day to avoid rust that otherwise occurs with the heat, humidity sweat and salt air that goes hand in hand with eastern NC summers.
Consequently in the summer I carry a stainless steel 2 3/4" Speed Six.
I have a 3" SP101 that is also an option, but it's almost as heavy as the Model 13 and offers no real advantage (other than being SS), and as noted above the GP101, like then 686+, is just a little to large and heavy for comfortable concealed carry.
It may be true that the 3" K frame is getting squeezed between the 3" J-Magnum and the 3" 686+, but that's also forcing people who would buy a 3" K-frame to choose the lesser of those other two evils, and given a 3" K-frame choice, I suspect S&W would sell a ton of them.