I think the Nets could win 60 games. (They could also win <40 games). But if they actually get it together and play team basketball, I think they have the most talented roster in the NBA. They have people who can create. They have tons of shooters. Imagine this lineup...
PG - Kyrie
SG - Seth Curry
SF - Joe Harris
PF - Durant
C - Ben Simmons
There isn't a team who could trot out more great shooters and have the team make sense like this. Even though it is small ball, you still have two solid 6'10 players on the floor.
People mock Ben Simmons shooting, but 61% FT is still in the same range as Looney (60%), Wiggins (63%) and Draymond (66%). 61% is terrible for a point guard, but acceptable if he is playing the Draymond role.
Then off the bench they have TJ Warren, who could score 20 points on any given night. Nic Claxton should continue to improve and played decently last year. I'm sure he will start most of the time. Royce O'Neale and Markieff Morris (who I hate) should add toughness. Patty Mills can lead the 2nd unit and also brings shooting. Cam Thomas will also be improved.
This is also a team that could play great defense. Imagine this lineup: Ben Simmons, Royce O'Neal, Kevin Durant, Markieff Morris, Nic Claxon. That is a nasty defensive team.
Ultimately this is a team with 3 potential All-NBA players - all still close to their prime. I think they get past their issues and have a good season.