some classes i expect to rare see after jobs (mainly MRD/LNC/PUG and possibly GLD) the mages i fully expect to see both, since each one can go from being just a heal or nuke to a mix of both whenever. And of course ARC to bard is a heck of a change, but im guessing people will be "lol why are you not bard yet? its SOOO useful...GET IT NOWZ".

MRD/PUG/LNC are pretty much always acting as pure DDs (or for MRD backup tank) so there is almost no reason not to be a job. Just expect to almost never see...or never need to use some classes ever, its pretty much bound to happen.