I would only release him if the team doesn't like him. He might need treatment though, but I would not release him unless the team hates him or something. I mean he is a good player and might need like actual help. It wouldn't surprise me at all if they released him though, it seems like something a professional sports team would do.
It is really hard for us as outsiders to know what conversations they have had with him. I think after his first DUI, which occured like a night before a game, they probably had some serious talks with him about what he is doing and what he needs to do. Him being in the exact same situation seems like those talks did not take hold. I am sure if Lawson says I need help and will go to rehab until I am completely sober, it may actually be illegal for the Nuggets to cut him while he was dealing with a medical problem. That being said, it doesn't seem like he is happy there and they are moving in a different direction of a team. Unless he fights it, and they can't trade him anywhere, waiving him could work out best for everyone.
I do hope he gets help whatever happens. As I said earlier in the thread, you are not getting caught drunk driving the only times you do it. If you are getting caught multiple times, it is happening even more.