No need to feel guilty, it really is just heartbreaking. We can all assume that BM, as upbeat as he has been, has had open conversations about where the team is heading in terms of management.
I would bet the farm that he has had open conversation about when and who they should be looking at to replace him. This is much better than hushed conversations when he's not around, and really, that's the kind of guy BM seems to be.
We should assume that he has it covered, and just enjoy the time left we have with him rather than secretly worrying that he's going to leave us in the lurch.
When he's ready to back off, he will likely announce his replacement, and it will be a press conference filled with tears.
Let's not rush thoughts of that day