Killer App Being Killed by Halo

I have been noticing a slight change in language recently. Instead of people saying 'killer app' more and more poeple in the games industry are saying 'Halo'.

This is our killer app.
This is out halo.

They need a killer app.
They need a halo.

Not hared anybody from Nintendo or Sony saying it, but all the western journalists and Microsoft folks seems to have gotten used to the term. Not sure if it will stick.