This question is on hold because it is overly broad. However I do not believe the question to be overly broad at all. Only the title is wrong (and overly broad). The contents of the question actually has a clearly defined question:
From the text:
I just want to know if adding a DHT to the worker nodes would be feasible? This should allow redundency and high availability out of the box as DHT's are quite good at that.
Which I would translate to the question:
"Can an entity system with DHT be used to span an MMO game over multiple servers to improve the redundancy and availability?"
Or something like that.
So the main question of this meta question is: Should we not alter the title of this question instead of just putting it on hold?
On a side note: I think we're a bit on an on-hold spree here. Way too many questions get put on hold. Yes some are very bad, but questions like the one I refer to only need a small touch-up to be valid. I think putting so many questions on hold, often without letting the poster know why or how to improve their question makes this community very inaccessible.