Interesting question: will Goldschmidt stick at 1B if the DBacks end up trading J-Up to Texas for Mike Olt+? Would acquiring Mike Olt mean Goldy will move to an OF corner spot since he is probably more athletic than Olt? Olt played 3B in the minors, but the DBacks already have 2 promising prospects at 3B in the minors in Ryan Wheeler and Matt Davidson. Obviously in the short term (this year) if Goldy goes to OF and has 1B/OF dual eligibility, it will increase his value, but long term I believe he is a better value at 1B.
It is merely a hypothetical to think about, but my best guess would be that Olt would be the opening day 3B and Goldy the opening day 1B. Continue to groom Wheeler and Davidson in the minors (both likely wouldn't be on the opening day roster anyway), and have an OF of Kubel, Eaton, Ross.