We know from the attempted hire of Liam Coen what he is trying to do on Offense. He even mentioned he wants a OC who will compliment his run-first mentality with NFL/Ram-like passing concepts. Everyone in football is copying Sean McVay, so it may be hard to get an actual Ram assistant coach, but that's the desired direction. I expect some news on the OC front in the next week or so.
Even with Campanile's loss, Addazio may have some wiggle room on D. Reid's status remains unknown. There was speculation that he would retire. Maybe with Campanile gone, Addazio can talk Reid into coaching one more year.
Losing Campanile as a recruiter hurts most. Given the lame duck status, recruiting this year was already going to be difficult. Without the ace, it gets harder.
If Addazio still believes in long-term success at BC, then he can't just find good coordinators. He needs to empower them so that BC finally exceeds the ceiling Addazio has had regardless of who is calling the plays.