It will become the default once it is ready to become the default. Usually there is a reason it is not the default.
Originally Posted by deanjo
As a normal user you wouldn't change your ddx acceleration anyway, would you?
The better method by the way is creating a file
For some reason this is probably going to interfere with prime.
Identifier "Intel Graphics"
Option "AccelMethod" "sna"
You could also compile xf86-video-intel with --with-default-accel=sna so you won't have to do anything.