To me, if there’s a trade to be made that, in the mind of the GM, makes the team better in the short-term and provides more flexibility going forward, I would be upset if they let it fall through all because of a pick swap. Chances are that swap is going to end up being less valuable to the Spurs than a 2nd rounder, and no one would’ve batted an eye against that.
Yes, there is a chance it becomes disastrous, but the chance is so small that you can’t let it dictate the trade. In 6 years, Brown and Tatum will be 31 and 29; even if they’re no longer with the team, it’s not like the expectation would be that they left for nothing. But the more likely scenario is that at least one, if not both, are still with the team. That team would be expected to be a playoff team at the very least. Sure, there’s always the potential for injuries that can derail a season. Again, I would not kill a trade because of that fear