While I think that Dobson makes the team (and hopefully Harper goes to PS), I would guess that Belichick takes the entire 2013 WR corps, or lack thereof, into consideration. In other words, people were high on Kenbrell Thompkins that year as well, and you see how well that worked out.
I don't think we should give up on Dobson just yet, but I also don't understand those who continue to make statements regarding his awesome talent either. He may benefit from the injury to LaFell, and the fact that he knows the system better than Harper/Wayne, but there's definitely still some uncertainty to his situation. All we can do is hope that it works out.