I know, completely different developers and code that would make it impossible to implement without reworking ESL from the ground up, but what if Elder Scrolls: Legends, just the card game, was implemented into ESO in a similar way as Gwent was in the Witcher 3? I played the hell out of that game until it got canned a couple years back, and once the servers eventually get shut down, what if they just took the existing game and just made it a mini-game inside ESO? Challenging PC's and NPCs to games, there being new titles and achievements, new collectables, etc.
There would be 2 main downsides to this: first, development time would need to go to putting the card game in ESO, which unless they segmented it with an adjacent team or hired a new team to do it, this would take away from main game developments. The second downside is lore wise, since this card game isn't Lore-friendly, though the same could be said about Gwent in the Witcher 3.
Anyway... I know it's an impossibility, and this is just more of a dumb hypothetical, but as a what-if type scenario, do y'all think this would be a fun addition to ESO as a whole?