I disagree though... The 6.5 Creedmoor is what the 260 Remington could have been if Remington had actually spent half a second thinking about the cartridge and designing it for its intended use instead of just necking down a 308 case and calling it "good enough". It's not just better marketing. The Creedmoor case was designed from the ground up to efficiently shoot the most common bullet weights in a 6.5 and have them load from SAMMI spec magazines without the bullets eating into case capacity.
Its not that the 260 "doesnt work", its that there is a better way of doing things without as many compromises with the 6.5 Creedmoor. The advantages of the Creedmoor are not significant enough to run out and have all your 260's re-barreled, but there are enough that if you are investing in an entirely new rifle and starting from scratch, you would be foolish to go with the 260 with better options are available.
It's like people who sold their brand new cars during the gas crisis took on additional payments to get something that got at most 15% better mileage, that wasnt smart. But for a person buying their first car during that time period, it would make sense to buy the more modern more efficient alternative, all other things being equal. That's how I see the Creedmoor, and for the OP investing in a brand new rifle and planning to run factory ammo, it's really a no brainer.