BA have clearly been planning their actions carefully throughout this dispute, but I don't think this latest move to apply for an injunction will have been part of their long-term game plan. The clue is in JetSetLady's post -
This point of law was clarified in April following Network Rail’s successful application for an injunction to stop a strike by the RMT.
So it looks like this has only become an option from early April.
For me, though, the interesting thing is what happens after 12 June, whether or not the strikes take place. As I understand it, any industrial action taken after that date is not protected. Lots of people seem to think that at that point, BA will be able to 'lance the boil' by dismissing the strikers. But I don't think they can, unless further industrial action is taken after that date.
So where does that leave things? BA has already 'imposed' its preferred solution. No further industrial action can be taken without risk of dismissal. So does the status quo simply remain, since BA will have achieved their original aim?