Teams like Liverpool in the 70s and 80s thrived by making most of their appointments in-house. However, if guys like Las want to keep playing regularly for their last year or two they might need to move on.
I'd like to see Big Mick stick around too, but would not be surprised if he ends up with a role at Celtic.
As for Robinson, he seems very much his own man, and will choose an assistant that supports his philosophy over any other considerations.