The Rangers will be fine. Unlike the Mavs, they have a lot of youth that other clubs envy. I trust the front office to make the appropriate moves to maintain competitiveness. I do think they can compete with the roster as is though. They are still good. The only piece they are going to miss is Hamilton's production but I think Olt/Profar will help make up for that.
The Mavs are in bad shape. I will give you that. They need to have a huge offseason by landing Dwight and either CP3 in free agency or trade for Rondo. They have the room to do it, it's just whether or not Cubes can pull it off.
And hockey sucks.