1) If he keeps going at this rate, he'll be gone within 2-3 seasons tops. He isn't young anymore, so if they get another option in the next few offseasons, they may take it. The Lions made him look like a rookie.
2) I would get something else. If you want a DC jersey, I would buy Cooley, Fletcher (even though he's not young anymore, he's awesome), Hall, Orakpo, or Landry.