As a fellow single player, I can certainly agree such a DLC would be nice, but I also don’t think we are as ignored as all that. Sure, Siptah was not particularly balanced for single players - the devs even acknowledged this somewhere and said they plan to re-examine the balancing to make certain aspects more suitable for us - but that doesn’t mean the game is ‘not a single player game’. Unless someone can actually show Funcom saying that somewhere, in which case I will certainly raise a lot of noise about it.
The problem is that attempting to make a game that is functional for single player, group PVE, PVE-C and PVP is an ambitious move, and will inevitably result in difficulties balancing one against another. The very fact that none of those groups is 100% satisfied, and people from all of those groups look at other groups and say ‘why is the game being balanced for them and not for us?’, suggests that Funcom is at least trying to maintain this delicate balancing act.
To put it simply - no.
The game was sold with the multiple game modes - to abandon any of them after three years would be false advertising. And if Hyborian Jones is correct that they announced abandoning single player a year ago, why was the game sold to me less than a year ago as a ‘single player game’?
Personally, I would be extremely angry if Funcom decided to abandon any of the advertised play modes - irrespective of whether I play them or not - even if doing so might improve the game mode I play. That’s a part of why I support RodusMaxumus’ suggestion of a possible DLC - that would be a way to improve things for one play mode without harming others - though I suspect it may not be technically feasible.