Spurs tanked to get Duncan, Warriors tanked to get Barnes. Awful examples.
I know what you're getting at, but you didn't use good examples at all as 1) Kings never tanked. They're literally retarded, literally, and just never drafted well nor committed to anything outside of having Cousins. Wolves started tanking late, but tried rebuilding with Love and just never got to the playoffs although they were close. Again not tanking, just failing at what they were trying to achieve(which was the playoffs).
I do agree that tanking forever is bad all around though, creates a toxic environment for growth(as you mentioned) and there ain't no guarantee of getting that megastar you're looking for in the draft unless you land those first overall picks(as happy as I am that lakers keep getting 2nd overall, one first overall pick in the last 3 years would have been better than getting 3 2nd overalls.