The FAA already has done something, and will continue to deal with the issues as they evolve, much like the technology.
A license does not bring a flyer into accountability. That process creates another layer of bureaucracy, and probably a fee as well (read TAX). Nor does the license make it easier for LE to "find" anyone. If they are caught, it's not going to be because of a piece of paper. Accountability is achieved in part by laws that are already on the books. If caught, arrest, fine, then prosecute depending on the level of recklessness exhibited.