It wouldn't put the Cavs over the top, and it won't happen anyway. Here is what Wojnarowski said about the trade proposals regarding Amare : "the Suns want a combination of young talent, salary-cap relief and draft picks for him. "
The Cavs can offer cap relief, but that's it. Their picks have no value since they are not a lottery team. The best young talent they can offer is JJ Hickson and I'm sure Phoenix will want more. And they will probably get better offers.
Plus, Amare is really overrated and he doesn't know how to play defense, not to mention that he doesn't fit well with Shaq on the court, so imagine what it would be with Shaq and LeBron.