I think it'd be a fun idea, but A: lead to arguments (I wanna be Hermione! No, *I* wanna be Hermione!) (Though that's negated by the switching every few chapters idea) and B: be a little bit confusing. Plus, for me at least, it's a lot easier to listen to something being read then trying to read along with and catch "lines" in time --especially if you can't highlight all your lines to keep track of them.

Y?

~Sor