I think that FFI will still be around in the near future. There have always been more people using shake and combustion than FFI. While there are more people using other packages, FFI is still the Ferrari of compositiing systems, and as such, there are only a handful of artists in the world that can handle the interface quickly and efficiently enough in front of a client that's shelling out more than a thousand dollars or more an hour. These artist can create amazing imagery from scratch within FFI (but mostly within Inferno or Flame). It can do almost anything that these 'new' systems can do. These new softwares are definitely NOT the same as FFI, nor are they the same speed, or have the same capability.
Some commercials will still be finished on a discreet box (Sorry, AME box). What FFI excels at is realtime and quick interaction with the artist. You can't get better feedback and interactivity from any other compositing package, that I've tried at least (that is; Digital Fusion, After Effects, Combustion, or Shake).