I agree with you 100% Sydney S/H and the FAAA said "no-one" would be disadvantaged by the introduction of casuals.
I personally dont think the senority system will change anytime soon as the majority of crew are happy with the system. I personally would like to see a new and improved system but the chances of this happening are slim to none.
You should speak with the FAAA about this issue as they assured all crew no-one would be disadvantaged and the use of casuals would be strictly controlled against the permanent to casual ratio put in place. This is clearly not the case and needs to be addressed.