Giving each job a second spec: would it work?

[Fendred]

A better idea would be to give them utility abilities, designing dungeons and encounters around the varying abilities of each job. The reason this would be a good idea is that it would allow them to break the rules for how much damage a class can do. For instance, if a damage dealer is defined as a character who trades heavy armor for mobility, thus reaching places that a tank cannot, that could fundamentally alter the encounter design. Dragoons could jump to high places in a dungeon, dropping a rope so that the party can take a less obstructive path, a bard can shoot a switch to open a gate using a trick shot ability, or a ninja could stealth past some opponents to open a trap door. Black mage's sleep spell would suddenly have a utility benefit once again, and tanks would be more of a pure combat class than a utility hybrid.

I guess what I'm saying is it would be more interesting to have the dungeons and encounters designed so they can be tackled in different ways depending on party makeup than giving people variant specs for existing jobs.