Since the Korean Live Letter, we now know that they aren't going to use the PVP combo system for PVE, and will end up deleting Job Actions in the next expansion, if the translations are right.
You can refer to this topic: Korean Live Letter Summary
I want to suggest a system to customize the combo, similar to what Aion/Tera Online has, so that everyone will need to create your own. I imagine this as the solution for the quote: "In PvE we feel that the effective use of branching combos is one sign of player skill".
Customized Combos
This new feature will be in the Actions & Traits window as "Customized Combos".
Players will be able to put up to 4 Actions (GCD or oGCD), then put the first Action of the combo into the hotbar.
Following the image below, you create your combo and put the first one in the hotbar (Image Example: Skill 1), and by pressing the action, then next action will appear, and so on, until the last one, then repeat. I would like 24 lines of combos.
For oGCD, if it is on cooldown or disabled, it will be skipped to the next one. But when it is off cooldown it will automatically get priority accordingly to the position.
I would like to enfatize that this whole system will only be useful if the Combo Actions enter in the GCD queue, similar to the PVP Action system. Macros are not efficient for me for this reason.
Basic Examples
AST: Draw > Undraw: You can use "Draw", then "Undraw" will appear. When "Draw" is off cooldown it will appear again.
DRK: Blood Price > Grit: At first it will appear with Grit, because BP is disabled out of grit. Using grit, then you can use BP. The same can be used for "Blood Weapon > Darkside".
DRG: Fang and Claw > True Thrust > Vorpal Thrust > Full Thrust: FaC will only appear when the conditions are met, while including the traditional 1, 2, 3 combo.
MNK: 3 Actions in each line, with only 3 buttons the MNK could shift between forms without button bloat.
So much more can be done beyond these basic examples. We can solve a lot of button bloat problems with this system, while avoiding more deletion of cool Job Actions. I really don't want them to delete any action. I also would love a system for Job Actions Glamour, would be a nice collectibles for end-game content.