I am puzzled why there are no widely available laptop-like cases for the Raspberry Pi, especially considering that now there is a 8 GB version of it. "pi‑top [3]" came close, but it was somewhat childish and apparently it's not sold anymore.
So I can see why there's not much of a market. The hobbyists are largely doing something other than standard desktop use, and the people who need laptops (even cheap ones) are better served with something off-the-shelf. The best bet for the future are the handful of laptop-style docks coming out. Just plug your phone or pi into one of the external ports and go.