When I first came to Cambridge about 50 years ago, there were far more bookshops than now. The biggest was Heffers with several shops scattered across the town. Heffers is now owned by Blackwells of Oxford I think. I guess many people buy their books on the internet instead (in the main, I do), although browsing through books is still a pleasure.
In 20 years' time what will we do?
There are still a few independent second-hand bookshops around. One of these is David's shown in the photo. This has remained much the same over 50 years.