Regardless of anyone's opinion of Cespedes, he's likely gone, particularly considering he's been rumored to a be a bit difficult with coaches and doesn't even want to be in Boston.
Bogaerts is considered by many an elite talent who is still quite young and has plenty of time to improve, especially given all the big hitters he'll have around him now.
I was initially surprised by the Hanley deal, because I hadn't even heard it rumored, and I also know from living near L.A. that his defense is terrible and Dodgers fans are always complaining about it, but he certainly can hit, and there should be a lot of good defensive players in his general area of the field (Betts, Sandoval, Bogaerts), so I'm willing to give it a chance.