Hmm, should I tackle why exactly Blizzard won't focus on these? Sure. (bear in mind, it's not a criticism of the list, but a criticism of Blizzard)
1. Bring Back the Lore!
In their eyes they are. The problem is for them the lore requires that the player is a passive observer. Since Cata the Player hasn't been a part of the story, simply watched as the story happened around them. Nothing of the story or surroundings affect the player but nothing the player does affects the story or lore, even on a personal level.
2. More Focus on Social Aspects
NOTE: This does not mean we want more Twitter and Facebook tie-ins, Blizzard!
Yeah, see above. They think they are, but once again, instead of thinking social interaction, they're thinking social media. Such is the way of progress, despite being at best easily compromised and at worst more problem loaded than beneficial.
3. Player Housing
Oh they've outright refused on this one, saying that they want to do something "better." What was delivered was the facebook inspired game they called Garrisons which also ended up metering just about every aspect of the game. Some improvement.
4. Solo Dungeons / Skirmishes
But they don't want an MMO to be a solo game. No, seriously, that's their reasoning. Never mind the fact that outside of the joke that is PvP, current dungeons and raids which only require groups because a solo player can't hit the numbers needed to win the fights, the ENTIRE game IS a solo game. The funniest thing? They scrapped flying for WoD because they want people out in the world yet did nothing to encourage it.
5. Cut the Price of Entry
AHAHAHAHAHAHAHA! Oh that's funny. That's not going to happen. Of anything, after the fact that they have lost over 3 times the amount of players in the same amount of time as any previous point in the games history, they're likely to jack the price up even more and try to throw some lame excuse.
6. Slow Down the Leveling
7. More End Game Content
8. Bring Back the Challenge
I grouped these together because the reason is essentially the same. All the devs care about at this point is raiding. Now it can be argued that that is all they ever cared about but as of Cata it became desperately apparent with unfinished and axed content abounds. For the devs, raiding is their bread and butter so they don't want people struggling to get to it, they don't want to devote resources away from raid content (the phrase "you can have this at the cost of a raid tier came about as a result of this) and they want anyone who plays to be able to see all the content. To that end they will not slow down leveling because they think that raiding is more important that world exploration. They will not make more end game content because all they want to make is raid content. Finally they will not bring back the challenge because they want raiding to be as accessible as possible to ensure people stay. When you think about it, if Raiding was made prohibitive or removed altogether, Blizzard wouldn't have much of a game left.