The Nets wouldn't have interest. Nobody is trading for an athletically declining, 3 adverse, C sized big to play PF, in a league where 2 big lineups are on the verge of extinction.
The teams that would have interest, are the ones who are like this one: Desperately trying to attain or remain relevancy and/or can't attract stars in free agency. Maybe: Hornets, Mavericks, Heat, Trail Blazers, Wizards . . . I'm somewhat skeptical of the first 2, but in all cases, it would be because they don't have long term answers at C and would want the Spurs to take back the mostly bloated contracts of one of their C's.
I'm confident the Trail Blazers would do Nurkic, Harkless, 1st, but that's so bad that the Spurs would feel like they might as well keep him and see if he can adapt to aging in similar fashion as Duncan and Gasol.