Ironically, the idea of pilots calling in at the end of each day's duty actually came from BALPA!
I see it became BALPA's fault rather quicker than normal. It will be their fault when my Granny falls down the stairs next Christmas as well - just to let you know in advance. Perhaps you can tell us where that little gem came from.
Most pilots accept the fact that the company need to be able to contact them to make sure the program is covered - some don't. Unfortunately because the management of the problem is so poor they can't deal with the few who cause the problems for the many. The same people who did not call crewing in the past will not call crewing in the future either - no matter what the edict is from the company. - it won't make one jot of difference. Infact it is going to make it worse to start with. For many the easy way out will be to block window their entire roster - more so than before.