You're under the assumption that the show is mostly watched by book-readers or that if that demographic is upset that the show will suffer. They have been and its not. They've taken way more liberties for S2 than they have in S1. Jon going camping with Ygritte, no Reek, Theon executing Ser Rodrick himself after taking Winterfell, no Damphair, no siege of Storm's End, no Riverrun, Tyrion making Bronn Commander of the Gold Cloaks, Sansa being almost raped, no Jorgen and Meera, no dead city for Dany, Irri dying, Pyatt stealing the draogns, Xaros killing the other Thirteen and declaring himself King of Qarth, Arya not going exploring in the wartorn riverlands, Arya serving as cupbearer to Tywin and killing Ser Amory Lorch in a non-accidental way, etc. etc. etc.
And I imagine they'll do more in the coming seasons. Particularly Season 4 and onwards, because quite frankly AFFC is kind of boring and I haven't heard high praise for ADWD. That's fine. But why rush it. The creators have shown that when they see a way to bring something out for television (Twyin/Charles Dance's presence, more early development of Ygritte, etc.) they'll take it. And the hardcore book-readers, who you can see on IMDB or any comment section about the show, have already gone ballistic.
But they're a tiny fraction of the show's audience. For HBO to completely discard the books in S1 simply as to not risk pissing off fans when they reach AFFC is ridiculous. The first three books are great stories and make for captivating television. When the time comes, they'll do what they have to do. The creators shouldn't be criticized for staying relatively close to the first two books when the results have been fantastic.