At the moment, this is only a question because both media are being sold. But as ebooks become more widespread, you will see more publishers opting for e-only publication, if for no other reason than that they can't afford the paper process.
So... when the book you want is available in e, but not on paper... will you refuse to buy it? This is a question which, in reverse, is already being answered by ebook readers: Given the choice of a book on paper, or none at all, many readers are putting their wallets back into their pockets, and saying, "Call me when the ebook comes out." (I have been doing this... I haven't bought a paper book in at least 3 years.)
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