BALPA will realise that any challenge to it will result in BA threatening court action, that means BALPA will have to spend a lot of money on something they are not 100% sure of winning and so they wont bother! Hmmm where have we heard that scenario before?
Er no not really, these are UK based aircraft and the court case/EU ruling only applied outside the UK. Additionally BA management reaffirmed the UK scope agreement and all its clauses under oath in the high court during the case. Even they would struggle to wriggle out of that.
I'm not sure why its a bad thing, all the scope agreement means is a merger of seniority lists like the first Cityflyer. The Capts get a pay rise and the FOs get a long term career slot.