I worked for Waterstones 1998-2006, and the 'SF in bookshops' thing does seem to have changed, to my eyes anyway. There's just so much more activity online now, and bookshop sales of actual books aren't what they used to be. I don't think the book shop as "shop window" for books exists much in SF/F, whereas the internet is one massive shop window. Or so it seems to me…