Great presentation but I don't like talent tree.
Current classes need fixing but it doesn't mean that SE has to use talent tree.
They could always add skill/weapon affinity to fix some problem.
I.E Victimize II for PUG can be used by any class and it does most damage if you have seasoned veteran and use it as an archer (yes it's ridiculous how much damage it does as archer --

But SE can easily fix this by adding HTH damage bonus and increase/decrease affinity bonus/penalty.

Instead of having advanced class it might be better to just mix/match skill to fit into class role, while adding something like Title bonus

I.E by doing class quest you can earn titles such as "PLD" or "DRK" and putting on "PLD" title would give you HP/Mana/DEF bonus and ATK penalty as well as weapon and weapon skill Bonus/penalty (somewhat like FFXI did)