Obviously it's a downgrade, but I don't think it's that simple. The Pats don't very often just have Moss and Welker on the field. Instead of Moss, Welker, and say Holt on the field, you'd have Welker, Edelman, and Holt on the field, or Welker, Edelman, Tate, or Welker, Holt, Price, etc. Trading Moss would go along with a new offensive philosophy which would harken back to the more balanced attacks of the Super Bowl era. Instead of playing Moss as a decoy or trying to force deep passes, you'd have three or four receivers on the field, not even including Gronkowski or Hernandez, one of whom is bound to be open, and all of whom are capable of catching a pass when they are open. So in other words, you don't necessarily need to have that #1 superstar WR on the field - you have #3, #4 options who can actually catch (sorry Aiken, sorry Galloway) and can have just as effective an offense that way, provided you have some running game/play action that can set up some semblance of a deep threat. That leaves a Superstar WR like Moss expendable, and thus a tradeable asset that can help you in other areas of the team which aren't as set.