I have assumed that the door is now closed and have moved on, but I do sympathise with those for whom the stalled recruitment process has been a huge disappointment, especially if other options are not readily available.
I am not critical of BA for being unsure of how to proceed with those in the system, but the regular communication that was so enlightening in the early days of my application ceased as far back as January. It wouldn't have taken much to send another email saying 'hang in there' or similar in the last few months.
I'm a big boy and I can read between the lines, so it hasn't troubled me much. I was just delighted to have been asked for an interview, surprised to have been asked for a sim, sad that the exciting prospect of joining BA fizzled out without a murmur. Better to have loved and lost, and all that...