Well amschind, if I don't shoot beyond 400 yards and the ballistics of the 7mm-08 are better than the 6.5 CM to 500 yards, why would I prefer a CM then, especially if I can shoot a heavier bullet. I only shoot premium bullets 150-160 grains with Staball 6.5...giving me 2900 ft/sec with the 150 Swift Sirocco's and touching 2800 ft/sec with 160 grainers....I guess that is better as what I ever thought I would get with the 7mm-08 when I started out with it...that is enough MV and ME for me on the animals I shoot with it (deer, antelope and elk) inside 400 yards. So for now I am more than satisfied with the 7mm-08 and recommend it for anybody wanting a deer rifle with which you can also shoot elk size game if you keep your distances under 400 yards.
I agree, the existence of improvements to existing things doesn't make the older stuff any WORSE. I put together some 170 FP loads for my great grandfather's 1894, and that gun could easily kill an elk or moose at 100 yards. If you're not using heavier bullets then the "Creedmoor" mod does you no good. My thinking is more for folks who don't already have one, where a slight modification to the 7mm-08 might well replace the 7mm RM. I hope that makes more sense.