To be honest, I do wish the combos became more like PVP in the sense of for say; Warrior having two buttons dedicated to the Storm's Eye and the Storm's Path combos respectively. Nobody would ever hit the wrong combo button intentionally so having it be simplified avoids this issue...however there is a catch.
If they did simplify it so that the basic combos themselves simply can't be messed up(other than hitting the other combo during the finisher but you'll still at least get the effect), they'll have to consider many factors, such as making positionals matter more or adding some kind of actual effects, maybe for the Warrior example they could get a Butcher's Block combo to have some other effect even, and adding more actual buttons to compensate for the lack of buttons. Meanwhile for jobs that have actual button bloat like say, Black Mage, Samurai, and Machinist as some examples, actually fix the button bloat(Samurai; Ikishoten turning into Ogi Namikiri, Black Mage; Ley Lines becoming Between the Lines along with Fire IV/Blizzard IV and Freeze/Flare swapping depending on your element, Machinist; Hypercharge turning into Heat Blast and Spread Shot/Scattergun turning into Auto Crossbow during Hypercharge status) and go from there.
The thing I would be worried about is adding the PVP combo system but not adding anything else which would simplify gameplay but not add anything to the space left. And seeing how things have been going lately, I worry that is what they would do even if the actual idea wouldn't be so bad if executed properly...