Humans generally don't like change!
It's the experimenters and early adopters that help move the needle.
What cracks me up is someone that is against say the 7 Backcountry, but support something more obscure. Industry people have hinted that more high pressure designs are coming, so it'll be interesting to see if it actually happens and whether the naysayers will backtrack their stance.
I was somewhat early to adopt Tikkas, back when people said that they felt cheap and plasticky. Tikka was a joke back then - it was too new and different, to the American view of what a rifle should be. Many of those naysayers are now the biggest fans of Tikkas! I don't own any now. Funny, how it works out!
The firearms industry is still operating in the stone age in many ways, so I'm all for new ideas. The market then determines what is sustainable, and the cycle repeats with new ideas from those not afraid of change.
That said, the 25 Creedmoor is so dang close to the old 250 / 250AI that it's just a refresh, but with modern pressure and twist.
I'd be cool with a moderate performance, fast-twist, quarter-bore for medium range, paired with a fast .277 for long+ ranges. A 7mm 180gr is a beast for LR, but that's a lot of recoil. Assuming appropriate bullets available.