Irving and Durant both are leaving the team surely as it seems. They have both wanted their trades as soon as possible. Actually Irving was closer to be traded but the team made a decision and decided to give priority to Durant's trade. I have heard that Miami Heat and Phoenix Suns are the teams Durant want to go now.
Durant going to the Heat would give the Heat a big boost even if they will trade Butler for him.
IMO, I believe that Durant is more clutch and more team player than Butler, so I'm okay with that trade if that will happen.
As for Irving he has been likely to be traded with Westbrook. This deal would be great for Lakers but not much for Nets unfortunately.
We never know what would happen to the Nets, but Irving going to the Lakers, I'm optimistic that Lakers will reach the playoffs.