Sales for a lot of cartridges have been impacted by the CM popularity, from .30-06 down. Most affected? I would guess .243, 7mm-08 and .308 in terms of total number sold. If talking percentages, I wouldn't even hazard a guess.
I think the 6.5 and .300 PRC will affect a lot of others.
Seriously. I think a well-practiced and experienced hunter could take all non-dangerous game all over the world with suitable rifles chambered in 6.5 Creedmoor and .300 PRC.
Could be the best combo ever.