You know the answer to that question: it's because certain/many B&HA fans feel betrayed by one of our most loyal servants going elsewhere to continue his career development.
I posted a few weeks back that a Liam-Bruno combo might not be the worst successor. I strongly suspect it's too early for that though.
With Bruno, there are multiple factors to take into account including:
-- what can B&HA offer him at this stage, and
-- if a new manager is brought in, how will...