Gonna make a few points here, sorry for the list:
1) Brady's reluctance to throw to rookie WR's is vastly overblown by some. The only WRs drafted highly by this team in recent years have been Harry, Dobson, and further back Jackson. None of them turned out to be good WR's (for different reason), so it's not like Brady had talent he was refusing to utilize. If Brady was sour last year it wasn't over Harry specifically, but more about the general state of the team.
2) Cam only ruins the season if he either becomes a locker cancer because he lost his job (which I would doubt, given what BB and all of his teammates have said about him), or he is the starter all year which means Mac isn't ready. And if Mac isn't ready either, the season isn't going anywhere regardless. At least with Cam you now have a backup QB that you know can win you 50% of the games he has to play.
3) I wouldn't disagree on seeing what Harry can do in his third training camp, if it had not been for the recent public comments. Once that's out there, you now have to question whether this guy is going to give you an honest effort for a team he doesn't believe is on his side.