""too late" for what? "
Too late in that the MMORPG market is already being saturated, and unless WoW can somehow offer something better/different, then it'll probably look a lot like every other MMORPG. And I'm not paying $12.99 a month for something that's just a copy of another game.
"WoW to the Sims is a bit of a stretch."
Just in the advance press: Sims Online was supposed to be the EQ killer: the MMOG for the masses. Hyped as being successful before it even launched. I see WoW being given the same over-hyped treatment. Still, you are correct: Blizzard has a good track record and their fans are loyal. That's good: they'll need all the help they can get.
As to another poster's dismissal of Battlenet problems: well, if we can reward Blizzard for their good games, and use that as a measure of WoW, then certainly how Blizzard mismanaged the security of BattleNet can be applied to how they plan to do WoW. As I said, they will need to be sure that security is maintained.
My wife will never play a Blizzard game again, as her high level Diablo 2 character got hacked and pillaged of items. Doesn't really make her feel very confident about WoW.