If 4.0 or in the future SE actually introduces something that would enhance or give more variety to jobs without it being hotbar bloat like skill trees then Red Mage would be the gateway to this concept.

Red Mage could be made a DPS, a healer, or a support/both.

Otherwise I don't see it happening anytime soon, or they'll likely butcher the job.

Also the Spellblade/sword magic gimmick is for Mystic Knight so if people actually want that instead of a legitemate Red Mage, (that can do black and white magic with melee combat capabilities) then they should just make Mystic Knight instead.