If the CBA somehow is not renewed, the Redskins will become the Yankees of the NFL. Look how much money they spend on their coaching staff, if they don't have a limit to what they spend on players they will go crazy and have a team of superstars and twice the payroll of any other ream, like the Yankees.
The CBA will get signed. The owners don't want a no-cap situation because they will end up having to pay much more money to players. They were discussing it on the radio a week or two ago and said there were also definite downsides to the players as well, I don't remember exactly but I think it had something with free agency (like there would be no more free agency so their rights are stuck to a team until they trade it or let them out of their commitment to them) and/or they would have a lot less guaranteed money in their contracts so they could be cut without getting paid anything.
One of the main differences in opinion is actually just between the owners and relates to profit sharing. Currently revenues from sales of general tickets, most merchandise, and other things are shared among the teams of the league rather than just kept to the individual teams that generate that money, while luxury box ticket revenues and a few things like that stay with the individual teams. Teams from larger markets and that generate more revenue (Redskins, Texans, I think the Cowboys are up there, etc.) want less profit sharing since their teams make more money and have to send some of it to the lesser teams, while those lesser teams want a bigger share of the overall profits of the league since they don't generate as much money, and a few of those teams probably actually need all the money they can get to keep their team going (the Saints could have problems the next year or two without it). The players union is always wanting a bigger piece of the shared revenues (i.e. a larger salary cap) that they have to argue with the owners on, and I'm sure there are other smaller issues in there too.
I don't remember exactly what the specifics of not having a new CBA are, there are likely many articles on it that I can try to find, but either way it's basically a lose-lose situation for both sides if a new CBA isn't made.