not to mention that recent free agency pointing towards players going to winning teams or teams on the upswing rather than chasing bright lights or the much-ballyhooed nightlife.
Aldridge going to very small market SA and Monroe going to Milwaukee are a couple of prime examples.
That's even supposing that these players who you're saying are good enough to get the Nets (currently the 3rd worst team in the league) to the playoffs would want to sign there instead of with teams that have better rosters and are either already good enough to get in the playoffs or are close to it.
The Nets will have some cap room next year but why would anyone rush there to play when other (BETTER) teams will also have a lot of cap room to offer deals to shore up their rosters as well?
I think you have the wrong idea about free agency in the NBA. Two signings (Aldridge and Monroe) don't prove players only care about winning. And that's ignoring all the other free agents who signed deals to go to teams with no real championship aspirations.
Brook Lopez and Thad Young were both free agents and chose to stay in Brooklyn.
Robin Lopez and Arron Afflalo signed with the Knicks (and Carmelo re-signed the year before when he could have left for a better team).
Rondo and Kosta Koufos signed with Sacramento.
Lou Williams and Brandon Bass signed with the Lakers.
Tyson Chandler signed with the Suns, Brandon Knight re-signed with the Suns.
Monta Ellis and Rodney Stuckey signed with the Pacers.
Ed Davis and Al-Farouq Aminu signed with the Blazers.
Wes Matthews signed with Dallas.
None of these are teams which I'd consider contenders or on the upswing at the time of signings.
Sure players want to win, but they also want money, and only a few can get both. Of course Durant and isn't going to sign with Brooklyn this summer, he'll have his choice of teams willing to offer him the max (like Aldridge and Monroe last year), and he'll be able to get both money and a winning team, but what about the players who can only have one or the other?
Rondo got $10m from Sacramento, if Brooklyn offered him $12m you'd don't think he would have signed there?
Monta Ellis got $44m/4 years from the Pacers, if Brooklyn offered him $54m/4 years do you think he'd still choose Indy?
Now I'm not saying all the players I listed above are world beaters and can single-handedly lift a team to the playoffs, but they're all quality NBA players who can improve a bad team. No reason the Nets won't be able to outbid other teams on mid-level talent and field a team who can win anywhere from 30-45 games and avoid the bottom of the NBA lottery.