First off I'd like to say that I'll be happy as long as I get my pimp hat.
One thing I don't see happening is rdm getting the elemental en- spells. The primal weapons seem to be going down the route of adding elemental dmg and I think giving the ability to rdm will just wate an ability. Why cast en-fire when you could just equip an ifrit wpn for example. I do think that the most effective way of making the rdm a melee role will be to involve tp in whatever spellcasting abilities it has or maybe even to make one or two spells only available after a miss or something.