I think it is an interesting cartridge but we are essentially reproducing a bunch of old cartridges these days. The ballistics on the 25 WSSM exactly match the 25-06. Federal hasn't even started manufacturing a round for the 25 WSSM and why should they? The 25-06 is the same and I can't even begin to say how many more 25-06 rifles are out there than 25 WSSM. You can make the argument that the 25 WSSM is a short action but that isn't really enough to start ammo makers to go crazy over a round.
My opinion, good cartridge, but not necessary and won't survive long.
This is kind of the story with the .260 Remington, such a great little cartridge for deer hunting, near perfect for whitetails I think, but it is slowly dying away, but it has held on for almost 13 years now.