Let us get rid of the obvious -
I don't own SSG
I am in the entertainment biz, but not mmo's
This is just my opinion, not any better or worse than any other.
I am posting this so that even though SSG will certainly not use
this, maybe it will stimulate their thinking.
I will category this suggestion is 'Do something new instead of doing what everyone else does.'
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Get the rights to use Planescape.
Hire more creative staff.
Create the City of Doors (similar to DDO's current city dungeons hubs)
Fill it with quests (properly themed)
Introduce the new endgame.
You reach max level and you can choose to enter the City of Doors (one way trip)
You start back at level 1 planeswalker
Exp is slower than in the normal game ... 5-10 times slower.
All your gear from the previous world is turned into cosmetic gear.
You get to adventure, advance and live in the all new world dealing with the planes.
You no longer have contact with the past world ... everything is new for this toon.
Players in planescape can make NEW guilds (the old ones are cut off)
The only way to play a toon in the City of Door (and the planes in general) is to bring in a max toon.
There is your end game
2 worlds
but that is just me.