If SOPA neuters search engines, maybe users will resort to their own scans of port 80 (or whatever we designate to the "public" port) to find websites. The legality of scanning, and what is and is not public, may become a hot issue. We may get some legal clarity.
There's a decent comment to the blog post. This is not rocket science to understand. This could (unforseeably) spell the end for ICANN and the vast domain squatting business.
A user can attach any name he wants to an IP number.