If Apple was selling camcorders and dvd players that just work better with content produced with the iLife app suite then it would make sense to port it. I agree with others here that porting iLife would dilute one reason people have for switching.
Garage band? I know musicians who went out and bought a Mini just to have that and I've encouraged a few friends to get a mini or imac when they were sick of spyware and problems getting the free software that came with their dvd burners to make a video dvd on their Windows machines. iMovie/iDVD put a big smile on their face and since then they've also converted a couple people.
Porting it would be a bad thing..
Should Apple Port the iLife Suite?