You're deceiving yourself if you think "everything went wrong last year" and that's the main reason why they didn't succeed... Injuries are a part of this game and when you have no contingency plan in place, you should be expecting the worst. Maybe if its someone like MB going down, then you can blame luck but when it's guys like Bautista, Melky, Morrow or even Reyes and Lawrie, you should be prepared. This year the rotation is in a better shape of far as depth is concerned but the positional depth is terrible and there's essentially no one capable of adequately taking over in case one of the infielders go down.
Also, it's pretty naive to use JPA's failure (especially when you were one of his biggest supporters) to illustrate why "everything went wrong", considering the same mistake is essentially being made again with Goins. Hoping for a replacement level talent to suddenly turn things around and relying on them in a contending year is a fools errand and that's exactly what the fat man is doing again.
Claiming that there's absolutely zero chance of competing might be going overboard but lets not pretend that this team was actually built like a championship caliber team that failed due to unforeseen circumstances.