Bob, why bother with questions like that one? The idea is to enjoy a book and the choice of medium should be either obvious or unimportant in each particular case.
E.g. you wake up with an urge to read a specific book.
Now:
a) the weather is nice and you feel like walking to the nearest book store
b) the weather is shitty and you would rather download your copy
Of course, it branches further but all cases should end with you happily reading the book.
My point is, this is not a religious question. You do not have to convert to an e-book reader. In case of each book, you could have one, none or both, whatever pleases you and whatever is available. The chances are the e-readers will become better and cheaper in time, the paper books will become more expensive and harder to find but I hope the choice will be here for a long time.