The issue as I understand it with the CAD test (a test that you can actually pass by closing your eyes and guessing - very accurate that!!) is that not all EASA member states have approved it.
This is hardly surprising when you look at the sample of test subjects and the nature of the testing - all laboratory testing and ZERO practical correlation. The proverbial academic's wet dream.
Apparently, on good information, there is also an opinion amongst other EASA member states that the current CVD requirements are excessive and should be relaxed. It is the UK with certain backing from a rather large international civil aviation organisation (which must remain nameless) which is stamping its feet to get its way to maintain the status quo; this is hardly surprising considering the egg that will be spread right across the faces of certain individuals if they don't get the CAD accepted across the board.
Saying that, knowing the way the back corridors of arm-twisting work it is probably only a matter of time before they get their way.