We already have Rise of the Zilart, perhaps you mean Chains of Promathia?

I've talked about blue mages with my friend. We'd both love to see them, but they'd be horribly unbalanced. At lower levels, all their spells would be weak and next to useless. At higher levels, their spells would be so powerful it wouldn't even be funny.

I think their current selection of jobs is perfectly fine. They've covered almost every job that has ever appeared in the series.

A geomancer would be interesting, but would be extremely limited.