Gonna rattle the cage here a bit, it's POSSIBLE. But devs would have to do something like One-Tamriel with the level of overhaul. These are the things I've wanted for over 4.5 years playing ESO now:

1.) Remove the set class-system. Allow players to choose 3 of the original class skill lines when creating a character.
example: Dark Magic + Shadow + Living Death. Expand the morphs to be Stamina or magicka, AND damage or healing/buffing. This will create 4 possible morphs for every ability so we don't keep resetting and changing the morphs to the new meta every year. *This is possible because when 1Tamriel came out, all skillpoints were refunded for players to reapply since major skills and passives were changed.
2.) Choose a star-sign on character creation like classic TES. This is your mundus bonus on top of race bonus. You cannot change it without a crown store token or something. Make race bonuses 2 passives instead of 3. The starsign bonus is the "new" 3rd bonus passive. Stop making races the sole character passive bonus.
3.) Add 1H and spell skill line (I've seen this asked for in this thread and for years in-game chat). multiple destruction morphs: The "Spell hand" of this skill line can be Flame, Frost, Shock. The abilities each have Single target, cone aoe, and targeted ground aoe (ie Skyrim/Oblivion's Fireball, Flames, and Fire Wall spells). Does this eat into some class spells already like DK flames? Yeah. ESO shouldn't have been made an MMO copy-paste template imo. TES was about breaking free and making your "own class" from the plethora of options given to you.
4.) Add a spears/pole-arm melee skill line.
5.) Put penetration on the character menu.

Stop making classes. They claim that we can be able to become whatever we want for any playstyle. With the current system we are limited to nerfing and redoing the same skills to serve people wanting a "magicka/stamina morph of an old skill, next patch." The system needs to expand options a little bit.