In the NBA, as in all sports, a team is either improving or losing ground to the field. Even a team that has been to four consecutive NBA Finals, winning three of them, is not immune to this truth. Stephen Curry seems to be acutely aware of this as apparently he and other players have expressed their desire for them to go after DeAndre Jordan and Jamal Crawford in free agency.
Here is an excellent video delving into this by YouTuber RBtheBreakthrough.
Jordan could sure up their rebounding issues and provide outstanding rim protection. However it Jordan would have to take a pay cut to join the defending champs, as they have little cap space left. Crawford would provide scoring punch off the bench. Like Jordan, Crawford would also have to take less to rejoin the Warriors; Crawford played for Golden State in 2008-09 after being traded from the Knicks. He averaged 19.7 in 54 games with the club.