The 'we've all been shafted on SH and you're alright on LH' argument doesn't really help anyone.
Excepting those who are already in the LHS on LH and will, probably, remain in that position the natural 'flow' to LHS LH is through LHS SH.
Therefore, for the majority of pilots in BA who aim for LHS LH they will have to accept the new SH regulations. Ironically these regulations would have become law anyway in 2016. What is coming in is increasing the productivity for the SH crews whilst at work without increasing the number of days at work.
Nothing is ideal, we would all like to go back to the heady days of the 60's and 70's where one or two trips a month was the norm. It isn't going to happen unfortunately.
As far as the communications from BALPA BACC have been, in my opinion, atrocious and the 'we know best we'll feed you the crumbs when we deem fit' approach hasn't helped ease tensions.