This topic is being discussed in another thread:
http://www.flyertalk.com/forum/showthread.php?t=405575
There is no guarantee that FFNs will continue. They will not continue indefinately, but the majority of people here think the promotion still has legs.
I think they will flush out the discount (PL) FFNs with at least one more round. But if the industry continues to improve, I think we will see them disappear, at least temporarily.
I'll call the courtesy card desk later to see if I can get an inside line.