Again, you are both pointing to the short term pains of why we shouldnt. I also disagree with Nevilles major contention, even Jetstars EBA says all pilots shall be offered it on joining. Buchanan wants rid of it, so just negotiate all the protections you want in return for giving it up.
I am an FO that scores well (I'm told) in cyclics so make your own mind up how I would be affected.
Edited to add that if Nevilles concerns were valid there would have been even more Jetstar DEC's. None of them are on B or C scales.