Will job gauge be one single HUD element...

[Arutan]

hopefully we can turn it off completely and just use the status bar..like always

Well it looks like you can't escape it for the 3 tanks since you need to keep track of your gauge that is filling up, RDM too, you need to see your Sen on the SAM, the BLM need to see his Umbral Heart, the SMN need to see the disponibility of his trance, SCH is likely to keep an eye on his fairy gauge too
It seems to also have some importance for the DRG, NIN, MCH and BRD but I didn't quite well understand their gameplay. So at the end, only the MNK, AST and WHM seems in the position to not use it