The media report that Wilson has resigned from the police department, which means he loses income (CNN says he did not receive a severance package), and he seems to live in hiding. (The media's -- and even Wilson's lawyers' -- sensationalizing of this point seems way over the top; what has happened to the rule of law? Look at this story on MSNBC, although CNN is more graphic.) To my reading, what really happened is really unclear. Why did Brown behave so out of character in the convenience store and then on the street? On the other hand, it's surprising that Wilson characterizes him as a horror movie monster, and that fully armed, could not have defended himself without killing him. Neither side of this mess "adds up". But what has happened to Wilson shows that the "system" can fail him -- a more "privileged" person -- just as it failed Brown. If the system failed me, it would end my life, with no memorials. Call if left-wing or right-wing "purification" if "you" like.
ABC News notes critical pieces of evidence that the grand jury did see, including damage to the police car, a witness's diary, and Brown's DNA in the police car, here. This does sound important.