LOL! That's hilarious.
I'm biased to the other direction because I think the Vision Cone is one of the silliest things ever in a football game (that, Create-a-fan, Weapons, and any number of bad ideas that popped up in APF)...
I'm not a casual gamer by any stretch, and there are plenty hardcores who think it's implementation is poor (in part because it looks ridiculous). There are some better ways to implement the concept I've read people coming up with, but they were creative ideas. Creativity is not exactly the Madden team's strong point, and the result is a cyclops-like beam so bright it can even shine at the same brightness in broad daylight... that's innovation, baby!
There's nothing wrong if you like it, but to say it's decrease is a result of casual fans disliking it, is not accurate. In reality, lots of people don't like it hardcore, casual or otherwise. It's one more of those ideas that nobody was asking for and few people pay attention to anymore.