Why should they be concernd?
Just because some wannabe Experts from the Internet think they know everything better? Oh please.
Lets see.
-They are exiling the entire console fanbase with this title so basing the population of Elder Scrolls fans as a whole as theoretical buyers of this PC/Mac only MMO doesn't apply.
-They have pissed off the vast majority of people that buy MMOs by not making the game the way they want it to be. Seriously, check out the NeoGAF, Giantbomb, Gametrailers forums, etc. as well as the initial reactions from many sites such as GameSpy's. It's incredibly one-sided.
-They are using that beyond pos garbage engine know as the Hero Engine to make this game which has received a huge negative following after it was revealed just how bad it is with SWTOR and the very mention of it is enough to make many not give a damn about this game.
-They are also not releasing this game until after WoW: Mists of Pandaria and GW2 have released and established themselves so they are going to be up their asses with competition.
There is a lot to be worried about in the position that they are in.