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Will people buy duplicate copies of books just so they can be read in the tub? (Not that paper is particularly waterproof... but the odd drip here and there won't short out a paper book.)
Our crack research staff did some nosing about and found several references to schemes and devices for waterproofing your e-readers. A site called Mashable.com shows a number of choices. Amazon also has a supposedly waterproof product. The Blog of Days does not endorse any of these, of course, but apparently the transition from paper to screens is no bar to the continuation of Read in the Bathtub Day.
Saturday will also be National Bagels and Lox Day. You can presumably bring your bagel to the tub along with your paperback.