EA are diligent when it comes to milking franchises. I wouldn't be surprised if we'll see another NFS game later. I'd say maybe in 5 years.
So far the history of the NFS series can be summed up as: joyous birth, happy early life, pampered and invited to a mansion, spoiled, then injected with a poison.. Resurrected horrificly, beaten to a pulp with facial reconfiguration, raped, anally raped, stabbed violently, skull-fucked, and finally tossed to the maggots.
It's a sad tale. Only EA would do such a thing to one of its original franchises.