As far as I know, western style arts are not needed for otakus in Japan. If we need it, there should be so much drawings like that. But I don't tell about future, because preferred drawing style shall change. For example, now there are so much Haruhi or Keion style from Kyoto animation, but this is a trend and it becomes a trend if it is good at both of drawing and story. It's simple. It will be a trend if people like it so much. So it must be loved, and that's all. Itaru style art is odd, but not so hated because they have supreme stories. ZUN is not so good at drawing, but he gives supreme musics and environment for participating to make derived stories from his game, so 2hu is loved, and someone draw 2hu girls which is cuter than ZUN's original. Therefore, art style is a part of keys, not only a clue to become popular. If you gives some supreme something, we'll adopt it whatever art style you used in that.