I haven't seen anything on the 6.5 Creed, but it should be very similar to 308, maybe better. Based on the research I've done a 308 is going to be good for at least 5000-7000 rounds and still be good enough for match use. Most hunters could get 10,000-15,000 rounds before accuracy became a problem.
The smaller the bore, the more powder you burn, and the more velocity you develop the faster you'll wear out a barrel. Anything leaving the muzzle at less than 3000 fps should last a very long time. The 243 is known to burn up barrels faster than many other rounds. I can guarantee a 6.5 Creedmoor barrel will last a lot longer than a 243. The 6.5-06, the new 26 Nosler and 264 WM are barrel burners, but not the 260, 6.5X55, or 6.5 Creed. Rounds like 25-06 and even 7mm mag also have a reputation for wearing out barrels at around 3000 rounds or less. A 270 is a little harder on barrels than 30-06, but it doesn't have a reputation as being particularly bad. It is 6.8mm vs 6.5mm and shoots similar bullet weights even faster than the 260 or 6.5 Creed.
One of the selling points of the 6.5 Creedmoor is that it should be easy on barrels. With the 140-147 gr loads commonly used by target shooters MV is a very mild 2600-2700 fps compared to 2900-3000 fps target shooters push hot 308 loads. If you are planning on using 100 gr bullets at 3100 fps you could wear it out sooner. But the cartridge and rifles were designed with the heavier bullets in mind.
Barrel life wouldn't even be on my radar here. Even if you wear out a barrel in 5000 rounds you will have spent $2K-$3K on ammo.