This one is tough for me. I certainly agree with some aspects, but not with others. Firstly, some comparisons to FFXI are unwarranted, I believe. You see, in FFXI there were barely any mechanics to bosses. They were incredibly easy to learn, and required even less skill to accomplish. The challenge mostly came from the time dedication you had to make as far as waiting.
With FFXIV, is it a bit too mechanics-oriented? Yes, I can agree with that. However, I like feeling more like I'm playing a game and being able to move and dodge as opposed to standing still. It is tough, on the other hand, because it does mean I often have to rely on others to be able to do that as well, which the OP touched upon. So, I feel right in the middle about that point, tough to say what I think here.
Also, as far as the "random" factor is concerned, there is some of that, currently in fights, such as conflags in T5 (as far as who they target), landslide/plumes in Titan EX, and the tank swapping in Ifrit EX. I'm sure this can and will be expanded upon with future encounters, but just pointing out that we do have some of that already.
More openness with party structure, yes I would definitely agree with. I think (and hope) that this is in the works already, considering the expansions to CT and possibility of Support roles being an option. We do have some, such as queuing as a solo tank or 2 tank or 3 healer or whatever. I know it's not exactly what was meant by OP, and still not exactly what I want to see, but it is there.
I'm not a fan of his/her view on lockouts, unfortunately. That is a system I'm currently comfortable with and would not like to see changed to trigger items or some such thing. I don't mind trigger items being an option for new content or something, horizontally-speaking, but not for BC or anything.
So all in all, I agree with some but not all of the points. Still an interesting post.
EDIT: I'd like to add that, not to piss on anyone's parade or anything, but it is probably much harder to all of a sudden change some of these things at once. They have a development schedule, which they stick fairly close to. Overhauling a battle system is not likely. It's not exactly a "You know what? You're right! *flips switch*" kind of situation. What is likely, or possible, however, would be to do this in increments. Tweaks here and there. Which is already kind of happening, if you look for it.