I would be very disappointed if book view was removed from Sigil; I often switch back and forwards between this mode and code view to check that the formatting of my books has a satisfactory appearance as I go along - it's very easy to quickly change a style when something does not look right. Without book view, it would be necessary to open the book in an ePub reader, identify changes that need to be made, re-open the ePub in Sigil and repeat the process. Even something as simple as checking spacing between lines, images, captions would take a lot more time without book view.
I am also thinking about this from the point of view of anybody who may be new to ePubs. When I was learning how to produce ePubs, I learnt a lot using Sigil. I was able to experiment with different css styles and immediately see the effects on my books.
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