The GSW Warriors trade had nothing to do with Andrew Wiggins and everything to do with Darryl Morey (well, his tweet) and the luxury tax. According to
this article (done prior to trade deadline), GSW was facing
$60M to $78M luxury tax bill next season based on the reduced salary cap.
GSW will presumably get under the luxury tax this year. (According to this
Reddit post, they are $3,116,018 below the line although they only have 9 players, so they have to get up to 14 without going over the luxury tax level. I presume every day helps a bit on the prorated salaries so they will take as long as possible to get up to 12 and then 14).
I can't begin to calculate how much this trade is going to save them on repeater tax (particularly since they are getting a high draft pick this year) - and I don't mean next year but the years afterwards - but I wouldn't be surprised if it once it's all over and done with, it's like a nine figure savings so really any performance difference between DLo and Wiggins is really a wash.