The team's owner told KRLD-FM: "It's hard to build up in this time of the NFL. It's hard to build up enough edge to play at that level during December, so you better be moving or having your arrow going up rather than going down.
"We can't expect to be where we all want to be unless we play better than we've certainly played the last two years, and we've had a Tony Romo playing well, really the last two years and haven't gotten there.
"I've often said it is one of the biggest disappointments of my entire time to have Romo as quarterback and not be in better shape for the playoffs as we looked to his career. We need to change that."
The Cowboys have missed out on a place in the playoffs for the last three years.