It sounds like some of you guys don't really know what you want.
Is it safe to assume that no one here wants to go back to the EQ1 design where the group sits on their butt on one camp spot for an extended period of time while the puller goes out and fetches mobs?
If that assumption is correct, I honestly can't figure out why people criticize the solo quest design. It replaces the EQ1 model and gives you something to do in between group dungeons and raids without being forced to group.
If you think solo questing in MMOs is boring, how is that any different than sitting in the same camp spot in EQ1 for several hours straight?
There are much better designs than linear solo questing until you puke. GW2 was a good step in their zone events style leveling but like most things in this industry was completely half assed. There were far too few events that fired off regularly and everyone just ground one event until the next one was in range and you moved. 90% of their game world was useless for realistic leveling especially after the first rush was over or you had a heart hard on. Big reason for that was stuff wouldn't reliably fire off if there was no one around. Easily fixed they just didn't do it.
If they had made it so each zone had a large over arcing story that fired off in a series of events that were ALWAYS in some state of either being pushed back or advancing the game would of been pure genius. Now it didn't help things their classless PVE was crap and the story was awful but in the leveling ideas they were almost there.
Now if I were king and TESO was my baby and I had 5 years to do it over again I wouldn't go with the mostly linear quest design. I would go pure skill base (which is mostly in game as is), no levels and design the world just like Skyrim or Oblivion. Go where you want, do what you want and dink around with whatever. Spawn the 10k people in 200 different spots or so and let people spread out and find their own way with the "story" working just like it does in Skyrim / Oblivion. Mostly optional and is just one of a million other stories in game.
I would also make the worlds living, just like the single player game with a fairly quick day night cycle so people can have both without having to wait to much.
Since PVE leveling is a fairly casual affair let people do it just like that. Casually. Throw some group only areas that have some really good drops for groups to level skills in. Maybe put some PVE raid mobs in there for end game and call it a day. Heck why not copy EQ and kill some gods?
PVP would be entirely separate with no levels and just the realm ranks and gear which only came from PVP. No balance issues that way.
Hire some WoW animators, get combat looking tight and nice. Roll around like scrooge Mc Duck in the money vault when people jizz all over the game.