I mean, he is really valuable for the PG position... But the Spurs shouldn't exactly be trying to stay afloat, especially if they're trading him. I'm actually a bit bittersweet about this recent success the Spurs have been achieving: on the one hand, it's great to see young players improve, establish themselves, and generally look like positives and maybe even future building blocks. But on the other, it gives a false hope of contention that might shift the FO away from better long-term strategies in search of short-term success.
At their core, I truly think the Spurs are a centerpiece away. Not a piece away, like a Collins or Allen or whichever big man - but a centerpiece, someone who can elevate the entire team, be the focus of an offense night-in, night-out, dictate the pace of the game, and close out games as the star of the team. White is that man some days, but he's both inconsistent and far too fragile to be considered a "centerpiece"; Keldon looks to be developing in that direction, but I still don't think he'll ever reach those heights, since he lacks court vision and distribution instincts that help other star wings (see: Tatum) be the centerpiece of their team's offense. At his absolute peak, I see Keldon as a star, a great two-way player that can score on demand whilst also defending the other team's best wing. But not a Doncic type of player.
So, from this perspective, losing DJ at the middle of the season (which would naturally push the Spurs towards the bottom of the ranks) would not be a bad thing at all. Moreso, his value is unlikely to be higher than it is right now - he's a year removed from injury, looking better than ever, and leading the team. Unless the Spurs FO really think they can develop him into something "else" than what he is right now, the right move would be selling high on him after having rehabbed his value.
...for the record, though, this is never going to happen. I acknowledge this. Doesn't mean I agree with it, but the Spurs are very clearly aiming for one last playoff push in this Pop era.