Well see how it faces off against the USB offering. I think it will end up being similar to the USB 2.0 vs FW400 spectacle. However the difference in theoretical speeds will likely bring the USB implementation over it in overall speed, however I also think that it will require a fair amount of CPU to do so.
As such, I think it likely we will continue to see FW3200, if it is ever implemented, continue to be the choice for multimedia pros, but not many others, not only for the lighter CPU loads, the most likely better streaming support, and also because of the power delivery over the cable as well as cable lengths. As I mentioned however, this depends on the implementation and support for it.
USB 3.0 will likely continue to be the choice for most everything else. Thing is there is only so much that will really take advantage of it. External HDs will, but for those using RAID, as I mentioned, may end up going for S3200, so the USB bus won't truly be utilized in that case. Have to wait and see though.