I honestly don't know when people anointed Rowling to "literary" author. I'm not denying she has a talent for stringing together worRAB, but I've read countless fantasies and would rank the Harry Potter series well below my top 50 in terms of originality, plotting and characterization. I don't see why people are bringing her into the conversation as some paragon of virtue and dignity to slag Meyer.
This isn't even a defence of Meyer's Twilight series, who is, in my eyes, mainly a teen popular fiction-league writer. But there's nothing wrong with that.
As for a Twilight anime, I'm like, "So?" There are plenty of anime adaptations of various existing franchises these days, another one isn't going to change the face of the world for better or for worse.