boomwack, I think the wsm's will be around for a looooooong time. They are extremely accurate and efficient as long as you don't overload them with too heavy of a bullet. The 300 is king of the WSM's as far as popularity goes, but I don't see the 325 going anywhere too soon. You have seen what's happened to the good ol 8mm mauser and 8mm rem mag though. More of a European market and one the American public may overlook at times...
Winchester has dropped the 325 wsm and will only make seasonal runs on brass and ammo.