UK had a pretty good deal with EU. Now, securing a trade deal similar to that of Norway will require also accepting freedom of movement, whose termination was one of the main arguments used by Brexit campaigners.
The science & tech sector is gonna get hit badly. Some of my British colleagues here in Cambridge are very upset and considering to move out. For young progressive people, it's pretty dramatic to see a big regression in your own country I guess. The Guardian is registering some of their opinions, and they are pretty heart-breaking:
http://the75percent.tumblr.com/
I imagine the finance sector, which fuels most London economy will get a big hit too.
Also, I have a hard time understanding how Brexit voters, who have a vision of a strong UK, did not factor in a more than likely split-up with Scotland after this.
Very disturbing. It seems overly easy to trick masses into acting irrationally.