That could happen, but it is a nightmare scenario. It would essentially attack the agency you and your browser has; in effect, it would obligate your browser -- and your computer -- to do as a server tells. Having full control over your own computer would be illegal. It also raises questions about whether such restrictions would cover your network. For example, would it also become illegal to null-route ad servers' IP addresses on your local network?

Of course, I wouldn't put it past regulators. In fact, copyright in EU comes close to doing exactly what the above would require.