Give me a break. Shelby Miller coming off the season he did with 3 years of control was going net a very good return. No one forsaw what happened, but clearly we still could have netted a very good package from some other team if the D-Backs didn't pony up. May be not as good as what we got, but still a very good package.
The rebuild would still be going well regardless of that trade. We'd just be a bit further behind than we are now. But we'd still have Touki, Fried, Wisler, Folty, Newcombe, Mallex, Peterson, Ruiz, and Demerrite all from recent trades. And add all that talent to the talent we've either drafted or signed and it's still an amazingly rich and deep farm system.