I think the 6.5 Creedmoor will be a dead end for them, like the .30 TC and .308 Marlin Express. Advantages which only appear in magazine articles don't last well.
Apparently Ruger, Winchester and Savage don't agree with your prediction of a 6.5 Creedmoor demise. Bet it eclipses the 260 in the next two years. From what I am seeing and hearing the Creedmoor is a home run.