XIV's Red Mage is based primarily around FFTA's from what I can tell. In TA it's an extremely powerful toolbox of every spell in the game + melee abilities from Fencer.
What you're talking about is clearly Mystic/Rune Knight, and I don't think we're ever getting that as it is too similar to Dark Knight aesthetically.
You might be happier with the new job coming.
As for predictions: At this point I've resigned myself to the resbot role and the limitations that come with it, and all I really want is for Embolden to either be removed or to apply to all damage types.
Embolden is the strongest raid buff in the game and accounts for around 10% of a RDM's contribution to damage, to know that 1/4th of that is just gone for every other caster in the party feels absolutely terrible. To know that it doesn't really work well with DRK and PLD, is frustrating. To join a raid or roulette and have no other Job who can make use of Embolden makes you feel like you picked the wrong job.
I had to switch off of it because one static member had been wanting to play BLM for a long time and there was no reason to handicap ourselves with a RDM.
Embolden as it exists today is an artifact of Stormblood, where the devs were experimenting with having a Physical Comp with SAM as the diamond tip and a Magic comp with BLM.
This never really came to be, because of all the mid-way jobs between full support and full damage taking center stage, like NIN, DRG, BRD and MNK.
I couldn't believe it was still there unchanged when ShB released, and can't believe it's still there right now, several patches later.
My other wish is for Verraise to be either crippled and limited, or removed entirely.
It's not part of the flavour of the job whatsoever, it's categorically against its lore as a Low-Aether spending mage, and it cripples its damage output ,which is kept med-low or otherwise it would be the best job by a staggering margin.
The worst part of this trade-off is that while Verraise is ridiculously overpowered in casual content, it is almost worthless in high-end content.
Whether it is useful at all depends on:
1) Do your healers have Swiftcast ready?
2) Will the raise be fast enough and allow the dead person to take their place in the next mechanic, or will it be too late?
The farther you go through Savage, the smaller the number of situations where the answer to #2 is a "yes".
So you essentially take the Res-Tax on your damage without being able to use the Res.
There's a million different ways they could go about fixing Verraise and making RDM a bit more competitive as a DPS instead of "The job you pick to prog and then abandon".
For example, make Verraise afflict you with Weakness, or make it cost 50% of your MP, or make it cost 50/50 Mana, etc.
As it is right now, it's paradoxically too good and too useless at the same time, depending on the content you're facing.