Deron will be fine. And the Nets will sort out their troubles. I will always root for him because no matter what stupid things he says, he genuinely wants to win more than most players. And he's crazy clutch.
But he made a catastrophic mistake when he signed with Brooklyn. He's such a perfect Carlysle player and he knew Dallas was going to be in position to rebuild with cap space. It seems pretty clear he was too concerned about another year of not being on a playoff team rather than picking the best situation to win longterm.
I think his comments now are partially about Johnson's system, but mostly buyer's remorse.