I disagree for a few reasons and here they are.
1) He's a hardworker and is willing to learn. I've met him a few times and I've actually talked to him for a few minutes each time. This guy is very intelligent and wants to learn. He is not afraid of criticism and will work hard to get better, no matter what it takes.
2) He's had some nagging injuries. I don't think he's been 100% this year. Although that's not an excuse, I think he can be a lot more productive than he's shown. He may not be the superstar that the Sox originally thought, but he'll be a solid player.
3) Once he shortens his swing, he can become a great hitter. This is something he needs to work on constantly. When he does make contact, he's as much pop off the bat as anyone. If he just strives to be a line drive hitter, I think it will all come around for him
Speaking as a biased fan of Borchard, I'm sticking to the optimistic side on this one.