I also don't get the talk of the Nets keeping Johnson now. They're going to be bad, no matter what. Yes, they have no incentive to tank, since we get the pick, but this is not a playoff team by a long shot, unless an insane number of things happen to everyone else. If they can cut more costs this year (ie the Johnson-Haywood trade), why on earth wouldn't they do it? What's it matter if they have the 6th worst or worst record in the NBA in 2016? I can't imagine Johnson stays on that roster if they can get a taker who sends back non-guaranteed contracts. Hell, we should facilitate that if we can.
Now that the Nets are below the luxury tax line there is no reason for them to trade Johnson. They'll put together the best team possible and try to make the playoffs. If Lopez stays reasonably healthy, I expect their pick to fall in the 10 to 15 range.
I don't see the playoffs as even remotely possible for them. They are (possibly significantly) worse than last year. Its not just DWill (who is far superior than any PG they have), but also Mirza and Plumlee who are gone. Johnson is another year older. They have zero depth, which is a huge problem being that their key players are old or fragile. They barely made the playoffs last year, and I would say 3-4 teams below them will easily leapfrog them. The only team in the East that I'd say is definitely worse than them is Philly. Everyone else is possibly/probably better. If you have no real chance at the postseason, why pay Johnson when you can dump him and save some more money?
Because they can make the playoffs. They resigned Lopez and Young because they want to compete for the playoffs. Dwill, Mirza and Plumlee are not a big loss. There's no reason for Johnson's game to decline much. I expect he'll play another 5 years around the same productivity. Miami is the only team below them that should definitely leapfrog them.
Finally even if they wanted to dump Johnson, it would be very difficult because he's making nearly 25mil. No team has close to that in non-guaranteed salary or cap space. So even if they could find a trading partner, the most they'd save is 10mil or so.
The Nets are going to try to win games simply because there's no incentive not to, but they didn't re-sign Lopez and Young to make a run at the playoffs. They re-signed them because they're clearly their two best assets and didn't want to lose them for nothing. They also represent their only hope of luring free agents; with those guys in place, free agents could talk themselves into the Nets being a few pieces away from being good. With a totally barren roster, they have zero appeal to free agents, which is a tough spot to be in when they also don't have any draft picks.
Also, the Nets are absolutely awful. They made the playoffs last year, but they won 38 games and only made it because Chris Bosh and Paul George got hurt. They also stayed remarkably healthy considering how old/fragile their key guys are. Take away their starting PG and the and their best backup big/Lopez injury insurance, replace them with scrubs, and you have their current roster. They're probably a lottery team even if they get as lucky as last year. If other teams stay healthy or they themselves have worse injury luck, they're a no doubt lottery team. If both happen, they could be giving us a Top 5 pick.