So I only have easy db access to 2002 to 2011 nba data. So first I took a look at the 50+ win teams from 2009 to 2011. I limited it to those years so there would be some history to look at before they were good. For teams that had more than one 50+ win season in those years, I just included the peak one. Here are the teams:
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season W L team
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2009 53 29 atl
2010 56 26 bos
2010 62 20 chi
2009 61 21 cle
2010 57 25 dal
2009 53 29 den
2010 57 25 lal
2010 58 24 mia
2010 55 27 okc
2009 59 23 orl
2009 54 28 pho
2009 50 32 por
2010 61 21 sas
2009 53 29 uth
Here are the worst seasons, if they got below 30 wins, for each of those squads before their peak, but not further back than 2002. (The teams in parens did not have a sub 30 win season in that time):
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2004 13 69 atl
2006 24 58 bos
2003 23 59 chi
2002 17 65 cle
(dal)
2002 17 65 den
(lal)
2007 15 67 mia
2007 20 62 okc
2003 21 61 orl
2003 29 53 pho
2005 21 61 por
(sas)
2004 26 56 uthAnd here is my very brief analysis of the key events that got those succesful teams to where they were:
ATL: mostly the Joe Johnson trade. They traded two future first round picks to get him, so being bad definitely helped. Being bad also got them Al Horford. They got a steal on Smoove at #17. Those three ingredients got them to 53 wins.
BOS: Being bad, and young (except for Pierce) definitely helped them get good. They traded the #5 pick from the 2007 draft to get Ray Allen, and traded young stud Al Jeff to get KG (and also just abused the Minny FO to do it).
CLE: Got terrible, drafted Lebronze.
CHI: they were bad a long time and didn't have a lot to show for it until finally drafting Deng, Naoh, signing Boozer, and getting amazingly lucky to get the #1 pick and land Rose. They made a ton of mistakes along the way, trading LMA for Tyrus Thomas and drafting a lot of bums over the years, but in the end they were saved by happenstance, and getting a great coach.
DAL: This one is also fairly textbook, it's just that they stayed good for soo long that their building phase was before 2002. Draft Dirk, steal Nash right after he was drafted, and they also drafted Kidd while bad - and while they weren't smart enough to keep him, they at least turned him into Finley who, along with Nash and Dirk, turned the team around.
DEN: Got terrible, drafted Carmello.
LAL: drafted Kobe, and are a special case as a premier FA destination.
MIA: They did it entirely differently, I admit. Not sure how a team can imitate them. But even they wouldn't be where they are now without having been bad enough to get the #5 pick in 2003: Dwayne Wade.
OKC: classic tank (trading prime Ray Allen for #5 pick in draft) and build through draft
ORL: Got terrible, drafted Dwight.
PHO: Free Agency wins here. Nash was the key piece. They still needed the home run of Amare at the #9 pick to make it work, though.
POR: Got terrible, drafted LMA and Roy. Ok, they didn't literally draft them, but it was draft day deals that only worked because they had great draft picks to trade.
SAS: Got terrible*, drafted Duncan. They were just good so long that it was before 2002 when they built.
UTH: Got terrible, drafted Deron.
*yeah, I know they actually weren't terrible. They tanked when the Admiral went down.