Boston's pick conveys. It's not likely to be outside 21-25. There are some good players who would benefit the Spurs who will be around at that range. Not great, but good. Stop worrying about that pick.
The idea that not getting Toronto's pick this season is okay is just silly. A FRP is a FRP. If nothing else, it is a STRONG chip in any potential deal. And if the Rap's pick ultimately turns into a future second rounder, it's a disaster for a team like the Spurs who need a talent infusion. Cleveland also has a FRP on the line, 1-14 protected, so they're a tank threat. Chicago has a 1-15 protected pick, so they have incentive to drop. Brooklyn doesn't have a pick no matter what, so they have every incentive to win in the play-in. Atlanta doesn't have a pick on the line, so they would be playing their hardest in the play-in. The only good news is that Charlotte would have to drop to 19 to keep their pick, and a lot of the potential tankers above are in the way, so they'll probably play to win.
The Spurs best chance of drafting an above average player is with their own pick, and they control their own destiny. And they're being stupid with it. They could easily have claimed the 6 pick, which still has great a great odds profile. As it is, I can easily see them dropping to 9 or even 10. Some people love to say that Pop is doing things the "right way". But tossing an obviously lost season to improve the future is just good strategy.