Back to the OP's original title question, it is the major distributors that drive the factory production. THEY want what SELLS which would be 30-06 and whatever the current rage is IE: anything Creedmoor.
They don't give a damn whether a few want a 300 H&H magnum or a 250/3000 Savage.
With all that being said, I would like a Tikka T3 Lite in .223 with 1x8 twist for my son please! LOL!