As I've said before, the biggest thing I notice is that Bautista is hitting a LOT more balls to center and opposite field this year. From watching his approach, I think it's intentional, and I think it's the reason for his reduced bat speed. Now maybe he's doing it because of bat speed loss, and feels it's the only thing left he can do, who knows. It also seems like he's not picking up breaking balls very well lately, which is interesting as well.
I know it's not a popular opinion, but I can actually see him being back next year (certainly not at his option price though). Trade Morales, get Bautista for ~5M, and let him DH and occasionally fill in at 1st, 3rd, OF. I really feel like he will bounce back some.