It certainly appears that way from today's game but I don't think it is quite that bad.
The injuries hurt. Take today's game. The Eagles picked on Booth all day and he was never up to the task. He was playing for Diggs. Diggs would not have allowed all those plays to succeed I am pretty sure.
I think Sam Williams would be better at DE than anyone Dallas played there. And of course Lawrence would help a lot too. I even think having Overshown would have helped with stopping Barkley. All those injuries hurt the defense a lot. Of course on offense, we did not have CeeDee Lamb or Dak.
Where the Cowboys need to add talent is on the defensive line, inside, and at RB. The offensive line is young and should get better next year just by developing the players they have. I wouldn't be against drafting OL, but they have to fix the interior DL, the edges and get a real RB. Rico got a 100 yards but so what? He leaves a lot of meat on the bone and no one is afraid of him.
With a bit of a commitment from Jerry Jones this team could be ready to beat the Eagles next year.