The Spurs made the right call with the trade
It was going to take a lot for the Spurs to part with White, and the Celtics were obviously willing to pay whatever it cost. They even agreed to trade a first that's currently projected to be 18th overall. That pick plus the Raptors pick gives the Spurs plenty of options in the upcoming draft. Moreover, those picks were undoubtedly the main reason General Manager Brian Wright pulled the trigger on the two trades.
Wright could even look to move Richardson for more assets this offseason. After all, San Antonio will have the necessary cap space to move him to a contender for assets ( i.e a future first) while being able to take back bad contracts. Ultimately, moving on from White definitely hurts, but the decision to do so was a smart one and could help the team significantly going forward.
Overall, the Spurs made two big draft deadline deals that could drastically alter the direction of the franchise. After all, by moving on from Young, Eubanks, and White, San Antonio figures to be worse over the remainder of the regular season, which could improve their lottery pick.
Additionally, they picked up two likely top-20 1st round picks in this year's draft. Armed with those picks, they now have the assets needed to move up into the top three of the draft and, hopefully, find a future star to pair with Murray. The Spurs' wild trade season appears to be a big success.