You mean like all classes have at some point?
SE has done reasonably well, in my opinion, at beefing up or nerfing down an overly weak or overly powerfull class, at the times the general population has flooding the forums with discussion pointing out the imbalance. They may not always do well with there implimentation of an idea for a class, but they have done reasonably well at adjusting it due to players suggestion to correct the issue.
For example, I was leveling ARC to be bard. I like bard in general and in concept. I have played bard classes in many many MMOs. Yet when I got to the point of leveling ARC, it was right after there big nerf. Every other Tom, Dick, and Harry was leveling the, at the time, the some what over powered lancer. It was clear by the 8 threads a day discussions of it, that my opinion of the situation was not unique. So, I knew the situation would change for ARC, there for rage abandoning of the class and up comming job was illogical. Much like your comment.
Even if BLM is not everything you desire it to be, it does not mean it will stay on the level it is upon release. After a patch this big, you can most certainly expect 1.21a, 1,21b, 1.21c, and so on, in terms of adjustments and fixes. As well as, possible large adjustments by the next patch.