Actually, the last 2 games the Cowboys have held the Vikings with Dalvin Cook, and the Giants with Saquan Barkley, to under 100 yards rushing.
Then there is the fact the Eagles run defense isn't much better than the Cowboys, and stopping Pollard/Zeke is a bit of a chore on Philly.
Also, the Cowboys outgained Philly the last time they met, and that was with the game in Philly and with Cooper Rush at QB. Rush threw 3 INT's that game.
Granted it's important for the Cowboys to control the Eagles running, but there really is nothing that suggests the Cowboys can't win, or even that they don't have a good chance to win.