Naxxramas

[Arnulf]

You don't need such an equivalent, but some people do, or at least strongly desire it.  Diablo 2 is not WoW and does not belong in the discussion.  People want to play WoW.  WoW is aimed at all style of players - raiders, small group and solo.  Leveling solo is easy, but it tends to be kill x foozles, gather y gizmos or deliver z to joe npc.  Solo instances would give a couple benefits.  Solo players could work on progression just as groups do - kill trash, strategize for the next boss... - and, given locks and resets like the 20s and 40s, players could maintain progression over multiple sessions.  This would be great for people with limited play time per day.  Such instances could be designed with different bosses/sections tough for different classes.  Would I love such solo instances?  Yes!  Do I expect to ever see it?  No.  I don't believe that Blizzard will ever see solo content as more than a grind offered to be able to market the game as solo friendly.
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There is a difference between limited time supply for playing and solo play. Instances are games in a game. Single player instances would be single player games only accessible by entering (and paying for) a multiplayer game. I do not see the merit in this.

However, I would love to see a feature where a 5-player group could, say, somehow save the current instance to continue on the next day. Blizzard is trying. Look at how Scarlet Monastery is structured. These are in effect four separate instances. A group does not need to do the whole instance at once. Same goes for Maraudon. You can do the purple part, on another day the orange part, or vice versa.