Well in Subaru's case the cost of CAS has dropped by 1/4th. From a 3K "Eyesight only" package on the top trim few years ago, to a 1.3K package on the mid trim this year that also gives you other features (e.g. winter driving assists, like heated mirrors, and so on).

From rumours Subaru wants to make Eyesight (CAS) standard by the 2018 model year (mid-2017 release).