This is trick question, because the answer is the same regardless of whether Boston gets Hayward or not.
The truth is, we are not beating Cleveland next year unless. Not with Hayward or without him. Adding him to this team does not make us good enough to beat Cleveland, and it would cripple the team financially for the next 3-4 years making us incapable of improving. Sadly we are more than one piece away from being a contender -we need a scorer (which Hayward takes care of) and we also need a starting big (which need me unable to get if we sign Hayward).
We actually have a better shot a beating Cleveland if we forget Hayward, and try to sign two lesser players who can fill those roles to a lesser degree. For example if we could sign a scorer (RudyGay, Gallinari) and also sign a big (Ibaka, Vucevic, Noel) using the cap space we have available, without letting anybody go, then we'd have a stronger all round team then if we signed Hayward alone.
Our future 3-4 years from now is bright, im not concerned about that. What im concerned about us now, and with the way this offseason has unfolded so far I just can't see Danny doing anything to really improve this team for next year. The opportunities I saw it there are all gone now.