My mophoto shows the front entrance of… where exactly? Well, it’s Heffers obviously.
Except Heffers now has a miniature Caffe Nero at the back, with at most half a dozen tables. Obviously, this means that Caffe Nero gets the most prominent sign above the entrance.
I don’t think there’s a single reasonably sized bookshop in Cambridge without an embedded coffee franchise. Even WH Smith has one now.
At some point the coffee beans will reach critical mass. There’ll be some kind of tall mocha fission followed by, oh, I don’t know, a dramatic fall in the number of staff on minimum wage in Cambridge.
Avaragado's blog 
Maybe there is some kind of book/coffee shop event horizon that we are rapidly approaching? (http://www.csua.berkeley.edu/~dxu/econ/shoe.html)