Any restructuring of contracts will still end in the team paying the player whatever he's owed. They may be in better shape when an eventual CBA is reached and salary cap reintroduced, but they still have to pay the person. You can also likely be in better shape by either cutting or buying out a contract that may, in a capped year, give you a bigger cap hit than usual. I could see Jerry doing something to this effect if he knew that a cap was coming. The thing is Jerry has signed some good players that are willing to restructure their contracts even during the season so that they are a smaller cap hit, ie. Ware, Davis, Romo. That's a good thing that you have players willing to move money around.
I could very well see the NFL playing the 2010 season without a cap and come the offseason after they put something together before the March 5, 2011 deadline of a lockout. And if this does happen and for some reason Roy Williams does not perform, I could see Jerry Jones cutting him to save future cap space in addition to other toxic contracts before a cap is implemented (Jerry usually is smart enough to know when this NFL stuff happens).