Unless they think they can make more money without DirecTV exclusivity by selling enough subscriptions on other platforms that hey'll gain more than they'll lose in exclusivity fees with DirecTV - note that this isn't about whether DirecTV will continue to carry the NFL (unless someone else gets an exclusive bid in), it's about being the ONLY place to carry the full NFL package.
The NFL might be happier with no exclusivity deal, but to allow DirecTV, Dish, Verizon, Comcast, Time Warner, Adelphia, et. al., to all carry the package, plus direct streaming service (Roku, AppleTV, web streaming) subscription.
The NFL has some challenges in the near future. It risks losing audience from the safety conscious because of the injury risk, from the purists who think football is getting too tame, and from those who don't want to follow the pc rantings of the open gay rights crowd. Losing part of their audience that isn't signed up with the company they have an exclusivity deal with might cost them even more support.
Why can't we just throw away the digital stuff for antenna TV and go back to what we had, for free?