Most hunters on this continent have no need for a heavy recoiling gun with the trajectory of a 30/06. A short lived fad is all.
Most hunters on this continent have no need for anything greater than a .308, but come hunting season I see lots of "magnums" and "Weatherby's" on the range being sighted in. Need has nothing to do with it. Sure the .375 H&H has made it's mark, but the .375 Ruger can be had in smaller framed more packable gun when you consider the Alaskan. With a .375 Ruger Alaskan you can hunt everything on any continent, it's as close to the perfect do all rifle that can be had at a reasonable price. Just wish it came in a grey laminate stock instead of the POS Hogue. The .375 Ruger will be around for a long long time, no worries!