It seems like a gross overpay by Golden State. If I'm giving up Wiggins, Wiseman and the 7th pick, I would want the #4 pick included too with Siakam. To me, Wiggins for Siakam should be a push. I'd even make the argument that Wiggins is the better and more consistent player.
That #4 pick could draft Jalen Suggs, who could help form a dynamic backcourt with Curry, as Thompson's return seems so uncertain. Suggs is legit, and the best player I saw in college basketball last season.