Please do not lock Jobs to the Weapon Class that unlocks them.

[Lerris]

Spoke to the dev. team to try and wrangle some more details regarding the upcoming job system. The current thinking is to have one job for one class. So for example, if you are a gladiator, the job you could unlock would be paladin, etc. Right now, we can't give any further details about the possibility of having multiple jobs per class.

To try and stave off the coming flood of "So if gladiator becomes paladin, then what will xyz class unlock?" You'll have to stay tuned for more details in the future!

"Current thinking" suggests, to me, that there is a possibility of increasing the number of jobs per class in the future.
And one job<->one class also reduces the number of combinations to balance should jobs not be locked to class.