Hey I feel what your saying but who's to say they won't steal EA fans even without a demo. Some people purchase games based on the gaming site reviews and everything we had read so far has been nothing but positive. I have a feeling the final version will have positive reviews too. If that's the case then I don't see why that alone won't increase sales. Heck Madden (and I have to go there) gets glowing reviews year after year and I believe that has a definite impact on whether people purchase that game or not.
People are so quick to take negative 2k reviews as gospel, well let's see how they react to positive reviews. I'm not saying the demo is worthless, but it's not happening this year so the fence sitters have to rent the game and/or read the reviews to see if it's worth buying.