Some of the newer fakes do have blue core.
http://imgur.com/a/hLuw2
(EDIT: From the OP, oops. Thought I had a diff't link. REFRESHER, I GUESS.)
Second photo. No clue if it'd be sufficient to fool a machine, but they're definitely becoming more sophisticated. (I'm actually amazed that they managed to go through all this work to make fakes and then screwed up something as basic as the leading.)
I'm also not convinced that minor differences in texture and playability are reliable enough to determine fakes, either. I'm sure we've all handled cards straight from the booster that felt odd; Japanese Innistrad had a definite waxy feel, at least the boxes we received, compared to the English version. (The key, of course, being minor differences.)

