Not even close.
Lopez was by far the Nets best player over their past two miserable seasons, and is the only reason the Nets managed to win 20 games. Without him they'd be lucky to win 10. Even as bad as they were, the difference between the quality of play was very noticeable when Lopez was on the court and when he was not. He also logged almost 500 minutes more for the entire season than any other Nets player.
At this stage of their careers, Lopez is also a far superior offensive player than Russell. Russell and Mozgov do not fix the Nets' biggest problem, which is their defense. I also do not see any free agents that would propel the Nets into the playoffs, much less sign with them to begin with.