Why not aim for NBA championship?
I guess they already understand that their current line up is not capable of doing it.
I think they are making some preparations for the later season since they have been dominating the playoffs this last decade and also won some championships. Now that they don't have the big 3 in their line ups, they need to reconstruct their team since it didn't work well with Demar Derozan. If they can find other good players to build up the team then their dream to get back to the playoff will become a reality since they also have a veteran coach in their hands.
The west has improved a lot, we have Dallas, Nuggets, Blazers and even the new look suns now can be a problem with the Spurs. What they do is stick with their line up, they still keep DeRozan which I think not worth for the salary he is making, so for me, they need to trade him to improve the team, otherwise, their best achievement will only be a playoffs spot.