The 7mm is a wonderful cartridge and you will see more representation at the LR matches in the future. problem is recoil and available bullets.
Really good bullets are coming on line that have BC equal/better then the 30cals. Now this helps with recoil in a heavy class.
In a light class, the 7mm heavy bullets have more recoil then the 6.5. The 6.5 also has a great head start in available bullets/tech.
The 6mm is also making headway with new bullets allowing this cal to shoot well at LR.
Shooting is slow to change and as long as the winners use a particular cal/cartridge, others will follow.
A 7mm WSM
in a 28 to 30" barrel launching 162 AMAX/SST to 180gr custom bullets is going to work great in a heavy gun at 1000yds.