Raptors weren't going anywhere with DeRozan as their best player anyways. I think its a good move because if they don't make the finals this year its time to blow it up anyways. If Kawhi unexpectedly decides to stay, all the better. If healthy, Kawhi is the best player the organization has ever had.
Lakers (and seemingly Lebron, which is a change for him) were prepared for this outcome. This year a long shot for any team outside of the Warriors. Other teams are smart to be making the best moves for 2-3 years down the road. The Lakers keeping all their young pieces and cap space intact for next year is the best move to give them a shot at a title in the next two years. Trading all the young guys for Kawhi might have increased their chances some this year, but they still would have had an outside shot. Keeping all the guys they have now and adding either Kawhi / Klay / etc. to that gives them their best shot to win A title.
We lose Cousins next year for sure, and the rest of the league is hoping either KD or Klay get pried away somehow as well. Lakers are smart to set things up for next year.