I think some people are missing the point of my post. I said something SIMILAR to previous titles, not a replica.
They've done it before with FFXII. That's similar to the sphere grid in that it's a grid.
Also like talent tree's in other mmo's no one has every talent in the tree. You gain talent points with each level up to spend in the tree.
To make each class different you wouldnt need a seperate grid for each one, you would just have each class start in a different position on the grid. As you progress you could learn all the skills and attributes in close proximity to where you start to really specialize in your class or you could make your way over to another classes area and form a hybrid class.
Theres a lot of room to make a unique class.
Where has everyones imagination gone....

At the moment FFXIV has no character progression.
Gain a level, get a new skill and spend attribute points on your class requirement... Boring.