I just did the new solo scenario that lead to the second parts of Isle of Thunder and i think it's a very dangerous road Blizzard shouldn't follow.
I can understand solo instance for hardcore stuff, like the legendary rogue questline in Cata, or the warlock one to get green fire. Also the timed one is fun, because it's optionnal and get tons of stuff. But this is daily quest ! Isle of Thunder is the thing you do daily, easily, while grouping with friends and guildies to socialize. There's ZERO point in making this part solo ! Worst of it: it's mandatory if you want to go on with the story.
Scenarios so far were for 3 players. In 5.1 the Krasarang special quests could be done in 5-man group. Why change that ?
I'm paying for a MASSIVELY MULTIPLAYER online rpg, not a solo game.