I guess what is really the problem? If it is something structural like a labrum or rotator cuff, then he probably needs to get surgery and take some time off. Be ready for the playoffs.
If it's something like a shoulder impingement, then he can absolutely play, but has to manage how he's lifting weights and take pain meds before every game. Those things can take like a year to heal, but they do heal.
All of us are hoping for the foundation to crack in LAL, but I never like to see a major injury be the cause. Total meltdowns are way more fun.
The problem is that the Lakers might miss the playoffs without AD, they really need him alongside Dwight and McGee to keep their forward rotation strong. Missing AD will mean that the Lakers will have to play LeBron and Green in the forward spots more often, taking away the size advantage the Lakers have over their opponents.
Rockets PG: Westbrook, Rivers, Clemons SG: Harden, Gordon, McLemore
SF: House, Carroll, Caboclo PF: Covington, Green, Williams
C: Tucker, Hartenstein, Bender
Warriors PG: Curry, Jackson, Bowman SG: Thompson, Lee, Poole
SF: Wiggins, Okoro, Anderson PF: Green, Paschall, MKG
C: Looney, Chriss, Smiley