Sure. But then, SPF is not meant to prevent all spam.
It would (if widely deployed) have a very wide effect on spam with forged senders though, and the consequent bounces to innocent third parties.
I agree bounce reduction would be a good thing. But, I'm sure I've mentioned it already, *SRS achieves same thing* without breakage.
To put it as an analogy (seems the done thing), I can use a plank of wood (SPF) to bang nails into a wall, but given the existence of hammer (SRS), the plank doesnt cut it
(and handing out planks so other people can make shelves isnt interesting).
The hype does not come from the people working on SPF, but from clueless hangers-on who apparently can't read.
Anyway, enough. The topic is indeed OT, and i'm just a net.kook.