Are people not really concerned with the diminished value most players will get as their usage decreases?
My main concern is what can they do to help their team when their usage does decrease. For guys that do not offer much else, it is a big concern. For guys that do other things, it is an opportunity to see them play a different role which is exciting (a more team based role).
How well can a guy play when he the ball less?
How much influence can he still have?
It is one of the reasons why I rated KG so highly prior to the drafted and strongly considered taking him at #5. He can have a huge impact on a game while scoring only 12-15ppg because of his dominant defense, high level rebounding and high post offense (shooting, passing) which enables team offense and makes the game easier for his teammates. Which is a strong contribution in addition to his own individual scoring threat.
On your team, Bill Walton is an obvious candidate at that. Michael Jordan is also a strong candidate. Even when scoring less, MJ is still a fantastic defensive player (both man D and team D) and extra possession creator (rebounds, steals, blocks) as well as understanding how to play off the ball and use off ball movement to create easier opportunities for himself (raising efficiency). Add that to excellent playmaking ability (key with Joe D at PG) and elite shot creation and scoring ability - fantastic.
Shooting ability also creates good value for stretching the floor and making it easier for teammates to exploit defenses. Guys like Chris Mullin and Klay Thompson on your team are some of the standout shooters in the league at their respective positions. Dirk on my team - I thought Dirk did more to help his guards (offensively) than any other big in history because of both the space he created and the fear opposing teams had of giving him room to get an open shot off.
The opposite is also true. Guys who cannot shoot with range hurt teammates value. On your team - Rodman. On my team - Wilt. Wilt's lane clogging also reduces space for others to operate in the low post. I passed up on a number of players because of that (Kevin McHale = who I love). It was too easy for the paint to become too congested.
Anyway, those are my thoughts about usage. My concern is "what else can players do when their usage drops?". And how well players can handle sharing the ball more.