Atlanta's in the wrong spot there; a 1-7 team with a nearly maxed out payroll. Be bad or expensive, but not both.
Sending Sanu to the Pats for a second round pick was a good deal for both teams. The Falcons need to get younger and cheaper, and the Pats need another reliable receiver to complement Edelman. And I guarantee there'll be gadget play featuring Sanu throwing a pass for the Pats somewhere down the line.