What it exactly does is it shoots heavier hunting high BC projos from a short/medium action out to a 1,000, and it does it with a Magnum class recoil just like you would expect. Does a 270? Nope. 270 WSM? Not to 1,000 and not the heavies. Its the same for the 6.5s.
The 6.5's in short actions are a pick your rifle weight, distance and recoil kind of menu. I like the 6.5 Creed. Needmore? Go PRC, we have and run both.
What about the 7s? They're great in a short action. 284 Win, 7-08. Like 'em both. Actually thinking about 284 Win maybe in AI, IDK.
BTW there is nothing wrong with 6.8 SPC ll (More versatile than the original being @ 200-300 fps faster) with the right throat, twist, in 3R, it is great slayer to 400+ & does it in a light mini action out of a short handy barrel w/puny recoil. Want to go to 600 and still use a mini action you can use a 6mm. Varmints? Close in to 4-500 save money and go 223/5.56. or a .204 Practical. To use a light mini action to 800 and past? Do it with a 224 Valkyrie. All with minimal recoil and efficient powder use, but you could load the 6.8 Western down for most of it if you wanted and get by.
Want one caliber to rule them all in a short action? It's probably a 308, ranging from 110gr to 180gr.
Until now. The .277/6.8 Caliber takes you from 85gr to 175gr. With monos and bonded and tipped projos, there isn't much you can't hunt in North America outside of the great bears with the .277. If you want more smack or reach, get a long or magnum action and go big.
Maybe your right, the 6.8 Western is DOA or will fizzle in the pan. Yet the military is betting the .277/6.8 caliber is the answer for them. They won't be doing it in a mini action though, they'll be doing it in a short action sized case, just like the 6.8 Western. If history is any indicator the military selection will become mighty popular before it is done. That may have more to do with the 6.8 Western's future than anything, and determine what eventual demand there is for it.