I think they will stay around. I wouldn't bet on the 7MMSM though. At least where I live , they are not selling. I am a bit suprised that the 300 WSM has done as well as it has just because its ina crowd of simular cartridges. The 300 Win Mag is well established as is the Weatherby model and the 300RUM Even the 308 and 30-06 are in the same class pretty much. OH well, if it sells guns, thats a good thing. I can't see much gain of the 270 WSM over the 270 Win but there again Its good for the industry.