I just completely disagree with the idea that you get your bats by trading away top notch, young pitchers who have a controllable salary. It's the reason I did not like the Alex Wood trade, and since that trade, we have noticed some struggles with our younger pitchers that we are now relying upon to get wins. You say that you trade them and just replace them with a free agent pitcher. OK. So, you are trading a pitcher who is 24 years of age and has controlled years left on his contract, and you are signing someone in the 29-31 age range for MUCH more money. That increase in age comes with an increased risk of injury and more potential for a decline in effectiveness.
I believe you can get the bats needed without having to give up Teheran or Miller in a deal. This is why you build up a surplus of pitching prospects in the system. Pitching is always a valued commodity, and teams will trade for young pitching all the time.
Yes, a guy like Price and/or Samardzija would be more expensive. But not necessarily more injury prone. An argument can be made that they have shown over time that they are durable and NOT injury prone. Does that mean they will never be injured? Of course not. But they have a track record of health.
They also have a track record of good pitching, especially Price. Now, Samardzija (who I include as a representative of several similar pitchers like Zimmerman, etc.) you are paying less in terms of money and years because their historical production has been less, but you also are hoping for upside. Price is what he is, a proven ACE.
Miller and Teheran both have a short track record of both excellence and mediocrity and their limited historical record really says nothing at this point about long term health (except that their deliveries appear to be more conducive to healthy that say a delivery like Wood or Hanson). Could Miller become the next Greinke? Maybe. Almost certainly not since the odds of that type talent revealing itself are so poor, but maybe. Could he become the next Hanson? Again, maybe. I don't think so because his delivery and stuff are both better, but maybe.
The same can be said for Teheran. The difference for Teheran is that he is on such a team friendly contract whereas Miller will get very expensive very fast through arbitration and eventual FA should he stay on his current course.
As for the viability of trading pitching prospects, especially prospects who are second tier because you would expect the Braves to have designs on keeping the first tier for internal use, I guess we will see. I suspect that it will be "welcome to 20 years ago." I think the cycle has changed where the relative nature of pitching as compared to the availability of quality hitting has changed.
To win the game, a team must outscore the opponent. Now, good pitching and defense LIMIT the number of runs needed but don't actually score any runs on their own. You have to hit your way around the bases. The old Snyder philosophy of focusing on pitching and not worrying about hitting was perfect for an era where bats were a dime a dozen and pitching was scarce. But, now the cycle has changed.
Bottom line is that ALL phases should be accounted for when planning for a successful team. The fact that the Braves only have one WS win to show for their dominant run of the 90's and early 2000's is at least partly the result of a philosophy too one-sided concerned with pitching as opposed to hitting.