Wiggy's point 4 sums it up for me too. Looking at the bid results most of the 2011 intake (the most junior unfrozen bidders) have chosen to go to LH, and the 2011 DEPs onto the 747 have also elected to stay LH. So that's an entire years worth of recruits who (mainly) have decided against a SH command.
It doesn't surprise me in the slightest high and middle seniority LH P2s' are sitting tight. They have a combination of a good income with a more sustainable workload and lifestyle. Let's see what changes come in the next few years with Easa and BA "optimisation".
Judging by the comments on the company forum it has bruised a few egos amongst one or two SH captains who obviously feel their position should be aspired to by every lowly co-pilot! The reality is people have bid for what they want, and right now in BA, short haul is proving deeply unpopular.