When new calibers come out they can create an interesting and attractive option for shooters looking to fulfill the role that the new caliber serves, but if a shooter already has a caliber in that category it may not provide a compelling reason to switch. For example, shooters of the .260 Remington didn't understand the "hype" of the 6.5 Creed and if you were happy with your .260 there is really no reason to drop it and switch over to CM (at least, for most shooters). But if you were looking to do something different than .308 then CM might be a better choice over .260R. What I don't get is the religion some folks get over their choices. Options are good and new stuff is fun. All cartridge designs had design goals and constraints and we continue to learn. That's the nature of engineering. What I find amusing is that the past decade or so seems to be a ballistic renaissance of lessons that the Swedes and Swiss learned about a hundred years ago with the 6.5x55 and GP11, respectively.