I'm quoting here from Jack O'Conners book, "The Hunting Rifle" (pg.66):
....."Nine-day wonders in the way of cartridges come and go. One year rifle nuts are in
a lather about one caliber; the next year they are swooning about something else.
In the generation that has passed since the end of WWII it is probable that more fine, classic custom sporters have been built in the U.S. in .270 caliber than in any other, except possibly the 30/06. The peasants may be conned by every pitchman that introduces a new super magnum, but the members of the cognoscenti stick with the
classic calibers."

Now, he wrote that about 30yr. ago, but the way I see it things haven't changed much.
I mean, what can we do today with all the new fangled cartridges that we couldn't do
then - within reasonable ranges. Heck, the guys at Remington, Ruger, Winchester, etc.
they know they got to sell rifles, and what better way than to bring out a new cartridge (ultra-mags, WSM's, etc.), get the writers to drum it up, work up crowds, convince a bunch of folks they can't live without 'em, make a few model changes/modifications now and then, and viola = profits!
Not saying that every thing new that comes along ain't useful, but needed? Mostly not.
Hunting is hunting. Unfortunately, most folk don't have the time, and in too many cases
don't have the real inclination, to develope proper hunting skills, and think the latest & greatest will get them by. Then there's those that want to impress their buddies in hunting camp with their newest acquisition, and/or win those endless arguments over
ballistics.
The "older" cartridges still work, and most even better today with modern ammo/bullets.
For big game hunting I like the following: 257Roberts, 6.5x55, 270Win., 7x57, 280Rem.,
308Win., 30-06, 358Win., 35Whelen, and 375H&H. And, of course, 30/30 & 45/70.
Make your selection from any of these, and you won't go wrong. And, as has been said
before, the 30-06 is never wrong
Right now, I've got a hankering for a Ruger 77 in 280Rem.