So, what, or who, do we get for him?
I plucked a few players that I'd put in Gobert's future productivity range as trade candidates:
Whiteside, DeAndre, Giannis, Beal, Love, Bledsoe, Nurkic, Drummond, Rubio, Middleton, Conley, Chandler Parson, Sullinger, Mirotic, Batum, Millsap, Horford, Valanciunas, Derozen, Vucevic, Batum, Dragic, Teague, Brook Lopez, Carmelo, McCollum
I used 538 CARMELO as a starting point for Gobert's comps.
Pretty short list and I'm sure one could argue some players on or off the list.
Then, if you consider contracts, free agency and salaries, the list becomes vanishingly small.
Keep Gobert