It is a rare quality these days to have the skills of Broony along with his physical & mental toughness. Usually today's "hard men" are thugs who can't read or play the game to a very high standard.
Our on-the-pitch leader doesn't necessarily have to be our holding midfielder. It is often centre halves who perform this role.
I don't want to retire Broony early but would prefer getting in his long-term replacement as soon as possible. This is so he learns our system with Broony as a mentor, understands fully what playing for the Hoops means and allows Scott some rest time during the season. This will lessen the impact on us when Broony does retire but may also lengthen his playing career by maybe another season if he isn't playing too many two-games-per-week matches.
I too can see Christie dropping back into this role as he slows down but not for a few years yet, as he is so dangerous further up the field.