After having owned a few odd chamberings I don't especially have desires to seek out and try out a lot of new sizes anymore!
I had a 7mm STW it went away. Also, .270 WSM and 6.5-06 and they have been sold. They simply had larger groups @ 400 yards than my existing rifles.

However, I did keep a 300 WSM that is very accurate and just keep on keeping it. I'm sort of surprised their popularity is fading.

In regards to all of the new smaller class rounds, my .270 or .308 will work for hunting game, and they must have good recoil pads because I'm not looking for smaller.