I guess I don't understand the Ill will against any particular rifle cartridge. I love the 6.5 CM and don't own one. Likely never will, but never say never. I don't see anyone anywhere twisting anybody's arm to switch or try different cartridges. And the introduction of a newer cartridge design doesn't take anything away from what older cartridges can and have done.

If you're happy with what you've got, then be happy. I don't care if you shoot a 38-55 or a 7mm Patriot, or a phased plasma rifle. Or, for that matter, even the 30-06.
If you're good with the .243, or the 45-70, and been good for a lifetime, then you're good.

But...
If you're new to rifles, and need something to punch steel or fur and do it well, with no fuss, the 6.5 CM is likely the best avenue to success in it's class.

If you live for the .270 vs 30-06 articles of the 1970s I hope you have some stashed in your old reading pile

"Chances Will Be Taken"