That's the nature of the position, not some keen observation. Chip Kelly's Eagles made a ridiculous investment in an effort to emulate the successful ground games like Dallas has. Spent big on Demarco Murray and Ryan Matthews to go along with Sproles. And it blew up in his face.
And since they lost McCoy and don't have a marquee back, clowns like Klempski will say anything to downplay that fact.
Dallas invested heavily in their offensive line and in Zeke Elliott. To turn around and not use those investments for fear or overusing them is as dumb as Jimmy freakin' Klempski.