Random Query: The Trinity System

[Defias]

So the goal here is really just to have a (unlikely...but I'm trying anyways...) friendly discussion/musing on the Trinity System in this game.

Simply put:
Do you believe FFXIV should keep the Trinity System?
Or
Should it adopt the model where every class is self-sufficient?

Once you've decided, please explain why you went with your choice.
For the sake of discussion lets assume the game can be changed.
This is to rule out the: "The game engine/architecture won't allow such a change." Responses.
Obviously this is a legit response. But it makes for a boring conversation.

Both paths have pros and cons.
To begin the conversation...I'll list pros to changing to a system of self-sufficiency.
Pros:
- Combat becomes completely reliant on player skill & strategy.
- Everyone can be the class they desire. A true end to: "___ job should be ___ role."
- No longer will folks debate on ___ role needing to do ___. (Ex: Healers must do dmg in addition to healing. Tanks must do ___.) As Damage mitigation, damage dealing, & Healing will be more or less each player's responsibility and not 1 roles.

Cons:
- Class diversity will probably take a hit to keep balance.
- Group gameplay will lack synergy as everyone can and probably will do whatever they want.
- Possibly no longer a reason to group with others.

IMO the pros outweigh the cons. But *shrug* eitherway I'm fine. Just curious to what others think.

Edit: Just noticed my horrible Title.
Wasn't paying attention to the autocorrect when I made this thread.

Edit 2:
I hear Guild Wars 2 uses a Self-sufficient system. Can anyone speak/elaborate on how group play works with that game?