John is very astute and very, very good at what he does but I'm not so sure I agree with the final assessment. Yes, the Marlins farm system is thinner than in past years and it will take some changes (good draft picks for example) to build it back up. But it can be fixed pretty quickly, if things go right. As it stands at the moment, given how many young players have been promoted, it is still quite capable of fulfilling injury replacement needs, should they occur for the 2011 season. Which is all we ask of it for the here and now.
Go read the post and see what you think.
Aside: I highly recommend that if you want to know about future major leaguers you purchase John's The Baseball Prospect Book 2011. I do, every year. It is the best around.