It all depends on what you want to do with the gun. If you just want to shoot long range then .308 is the way to go. Hunting at long range is a different matter. You can still take game on out there with a .308, but there are calibers that would probably be better for hunting? I really do think most people are shooting calibers that are complete overkill. To me a .270 is an elk caliber and complete overkill on deer. I even seem to recall reading years ago that the .270 was created for elk? A .243 will kill just about anything in North America so don't ever worry about a .308 not being enough gun.
With that said, the bigger bullets still offer advantages for hunting at long distances. You have more room for error with a flatter shooting bullet such as a 7mm mag. You have time to make precise adjustments in order to hit a paper target at long distances with a .308. You might not have that time while hunting. A fast bullet lets you shoot further without worrying about adjustments and your adjustments don't have to be quite as precise for the same distance.
So it all depends on what you want to do.