Eh maybe. I'm all for the 'next man up' mentality, but we have journeymen filling in for arguably our best two defensive players this year. Without Lee and Carter, it would be pretty tough for this mediocre team to beat any playoff contenders not named the Giants (not a shot at you, we just match up well with your team). And who knows when or if the O'line and D'line will get healthy.
I've just seen the Cowboys lay down too many times in situations like these. Or in true Cowboys fashion, fight all the way back just to blow it at the end.