The Bruins need a new and more talented head coach but I hope Sacco is not completely 'fired'. He is a good, hard-working guy who knows the players and the organization well and is clearly respected and there should be a place for him working with the players in some capacity. Not as an assistant again - that would be too awkward - but there are other roles he could fill.
If Joe prefers to seek a job elsewhere then by all means good on him, but if he does want to stick around they should at least try and accommodate that. He did a respectable job in tough circumstances, I think it's just pretty clear that the Bruins need to aim higher and properly overhaul the bench if they're serious about bouncing back up to the pointy end.