How long to wait for Williams?

If Vitt ends up being our DC, I will throw up. Honestly, I don't know anything about the guy, except that our linebacker play the last 3 years has been average, at best, and stagnant (with the exception of Vilma this past year). Someone posted earlier that he would bring intensity to our defense, but I just don't see it. I haven't seen much intensity in our linebacker play, so why should I expect intensity from the whole defense if he becomes DC?