Let's even say that hypothetically, this is true, and Miami does have a chance at signing Bosh
Could he even play with Beasley and Wade? That's a frontcourt that's going to struggle defensively and on the glass. And that's 3 guys that are going to be looking for alot of shots.
Assuming Beasley turns out even close to as expected, that's two max players already. They want another? Besides being wishful thinking, I'm just not sure that would actually be a smart move on or off the court.