I don't buy the "it gets kids reading" argument. It was used for Harry Potter before this as well, and with eight or nine or however many books, those kids just learned how to read Harry Potter.
I think Harry Potter had a not insignificant impact on the YA boom, the momentum from which was furthered by Twilight. Granted, it's YA, but what can you do? Children will read stuff that's interesting to them, and maybe, with time, they'll develop taste and expand their horizons. I think those kids have a better chance of becoming dedicated readers in the future than kids who only read the standard American high school curriculum.
The most important part of becoming a reader is learning to read for personal entertainment, especially when there's so much other more popular and mainstream forms of media around. And it's very unlikely that love of reading will develop from Great Expectations.
If you look at the ReadingGAF thread, and other such topics, you'll see lots of readers started with Sanderson or King. Some of them have make a point of going beyond sci-fi-fantasy and exploring other genres, while others are content with where they are. These are people who really love reading, and with the possible exception of Mumei, most of them didn't start with "American classics". At least, not that I can see.